15 Secrets of Commercial Divers

Boris Horvat, AFP/Getty Images
Boris Horvat, AFP/Getty Images

Imagine some of the most physically demanding jobs available—supply line installation, construction, welding—and then imagine doing them underwater. That’s the life of a commercial diver, a rigorously trained professional who undertakes everything from bridge repairs to oil line maintenance. To get a better sense of this often difficult and dangerous work, Mental Floss spoke to several commercial divers for their thoughts on everything from the perils of decompression to swimming in sewage. Here’s what they had to say about a life in flippers.

1. DIVING DEEP CAN PRODUCE EUPHORIA (AND A WEIRD VOICE).

Commercial divers receive specialized training—either in the military or at diving instructional schools—to learn how to function hundreds of feet below the surface. The lower a diver goes, the more water pressure increases, and the greater the challenges. Jeremy, a commercial diver out of Louisiana who repairs and installs equipment for oil companies, says that working in such conditions can lead to physical exhaustion, pulled muscles, and a feeling of pressure on the lungs.

Plunging to a depth in excess of 100 feet can also result in nitrogen narcosis, which some refer to as "raptures of the deep" or the "Martini effect." It's caused when divers receive a higher concentration of nitrogen from their air supply due to the effects of the water pressure on the gas. (The air systems that commercial divers use allow them to breathe normally by providing air at a pressure equal to that of the water, but the lower they go, the denser the gas gets, and thus the higher the concentration.)

“It makes you feel drunk or euphoric,” Jeremy says of the narcosis. “The solution is to switch from a nitrogen-oxygen supply to helium and oxygen.” That cures the over-inhalation of nitrogen, but when a diver comes back to the surface or to a decompression chamber, their voice will be altered. “It’s an Alvin and the Chipmunks thing,” Jeremy explains. Some diving teams will use voice augmentation to de-scramble the high-pitched squeals when divers are communicating with the surface.

2. ABOUT HALF A DOZEN OF THEM DIE EACH YEAR.

A diver works with a cable on an underwater construction job
Boris Horvat, AFP/Getty Images

Most commercial diving is centered around underwater construction—often repairing or replacing infrastructure that facilitates water, oil, or electrical supplies. Divers are frequently charged with digging trenches to bury electrical lines using high-pressure water blasts to excavate the ocean floor. If these trenches collapse, it can result in a catastrophic situation; the cave-in can trap and bury a diver, clogging their regulator or causing them to take off their helmet in a panic, which eliminates their air supply. Jeremy says a number of divers die every year in such cave-ins.

If divers can avoid that fate, they still have to worry about a number of other ways they can meet an untimely end. “We use cranes and those can fall or drop their load on you,” Jeremy says. Cutting into “live” pipelines can also cause explosions, as can using tools that displace hydrogen from the water. In an enclosed space like a ship or supply pipe, that collected hydrogen could catch a spark and explode. “That could blow your helmet off or into pieces,” he says. All in all, 25 commercial divers died on the job between 2011 and 2014, according to the Bureau of Labor Statistics; another 310 suffered nonfatal injuries or illnesses.

3. THE DEEPER THEY GO, THE MORE THEY EARN.

Diving jobs vary in pay according to risk, duration, and other variables, but generally, a diver’s base pay is usually supplemented with “depth pay.” The further down they go, the more they can make.

“It’s basically about a dollar a foot,” Jeremy says. “After 150 feet, the price can double to $2 a foot. Added on to regular pay, a 12-hour day can add up.” A diver working at 300 feet might net $1000 in a shift. Saturation divers, who can go 1000 feet down and are required to live off-shift in a chamber pressurized to the surrounding water in order to avoid decompression sickness, or the “bends,” can make even more.

4. SOMETIMES THEIR SUITS ARE HEATED.

Going deeper into the water means enduring more frigid conditions. To offset plummeting temperatures, divers need a way to keep their suits warm. “Below 80 feet, it gets cold,” Jeremy says. “We either pump water into a wet suit or wear a hot-water suit.” The former allows water to come in and make contact with the diver's body, typically from a heated source at the surface; the latter has water channels throughout the suit that branch out and keep divers from getting too cold. Because hot water suits can maintain a more consistent temperature than delivering warm water from above, they are most often used at 200 feet and lower depths.

5. THEY CAN WIELD FIRE UNDERWATER.

Most tools meant for underwater use are hydraulic (involving the use of water or other liquids), since they’re largely unaffected by water pressure. Fuel-powered or pneumatic tools (those that involve the use of gas) don’t really work, but divers can still make use of jackhammers, chainsaws, and other devices you’d find in an above-ground construction job. Others, however, need to be adapted.

“In my opinion, the most interesting adaptation is the BROCO torch,” says Brian, a diver based in New England. The BROCO torch uses direct current to ignite a magnesium rod and oxygen mixture that burns at approximately 10,000 degrees and can cut through metal like butter, even underwater. (A/C, or alternating current, is what we use in our homes—but because the direction of the current reverses many times a second, Brian explains, it can freeze the diver in place while electrocuting them, making it too dangerous for underwater use.)

6. THEY MIGHT FIND DEAD BODIES.

A human skull sits half-buried in sand
iStock

According to Jeremy, many recovery dives for people suspected of drowning fall under the purview of local law enforcement. Still, commercial divers can encounter someone who’s wound up in a watery grave. “I’ve done helicopter recovery jobs,” he says, referring to crashed aircraft that can harbor passengers. Once, while working on an oil rig, he stumbled upon a dead scuba diver. “It was more of a skeleton in a scuba suit,” he says. If a diver does find a corpse, they're unlikely to ever know the history of how the body got there; such discoveries are required to be passed on to the Coast Guard for investigation.

7. THEY CAN WIND UP FEEDING FISH.

A school of fish swim in the ocean
iStock

“We encounter marine life all the time,” says Mike, a commercial diver who now works primarily in and around the Great Lakes. “When working the ocean, if we are cleaning off marine growth, sometimes you will get some fish that come up and eat what you are cleaning off.” Mike says that commercial divers frequently spot sharks, barracudas, and other potentially dangerous sea dwellers, but the animals generally don't care much about humans. They’re even less likely to approach if the workers are using torches.

8. THEY SOMETIMES SWIM IN UTTER FILTH …

A common component of commercial diving, HAZMAT (hazardous material) diving involves working in contaminated water. That could mean anything from a lake affected by nearby lawn chemicals to checking equipment at a nuclear reactor. If it could kill or poison you, a diver has probably swum in it.

This kind of work requires a special approach. Brian says that those who venture into higher-risk HAZMAT diving usually wear a positive pressure diving helmet; since the pressure inside the helmet is greater than the pressure in the water outside, the helmet helps keep hazardous material from entering. HAZMAT divers also wear a rubber dry suit that fully seals the diver's entire body, unlike normal wet suits, which allow water to make contact with the wearer. Support staff will also decontaminate the HAZMAT diver after the job, scrubbing their suit free of harmful materials before the diver undresses.

9. … INCLUDING SEWAGE.

An overhead shot of a sewage treatment plant
iStock

Those stories you may have heard about people diving into sewage treatment plants to repair equipment? Those would be commercial divers, who occasionally brave the psychological challenge of being submerged in poop. Because it's usually impossible to see in a sea of feces, divers will study reference photos of empty tanks before going in. They'll suit up in sealed dry suits and typically will weigh themselves down in order to sink through the dense liquid; once they're in position, they work by feel. “Both the sewage jobs I dove on, it was repairing a masticator blade,” Mike says. “Picture a giant blender that makes solids less solid. I don't do it anymore because of the health risks.” A rip or tear in a diver's suit can introduce a litany of dangerous bacteria into their body: In addition to your standard Salmonella and Cryptosporidium parasites, such vile muck can also harbor hepatitis, Norwalk virus, E. coli, and assorted fungi [PDF].

10. DAWN SOAP IS A LIFESAVER.

Dawn dishwashing liquid is a must-have on diving expeditions. It can get diving suits and skin free of oil, and can even help divers cope with parasitic pests. When Jeremy was working on a mile-long pipeline near New Orleans, the shallow water resulted in workers getting infested with parasites carried by nutria, a semiaquatic rodent. “The hookworms will dig into your skin, die, and leave a big red mark,” he says. Splashing Dawn soap gets rid of the itch immediately. (If irritation persists, divers might need to seek anti-inflammatory treatment from a dermatologist.)

11. THEY WORRY ABOUT BEING SUCKED INTO A VACUUM OF DEATH.

Divers are frequently in violation of the laws of nature. Humans, after all, were never meant to thrive (or survive) underwater, particularly at more pressurized depths. Many divers fear encountering Delta P, or differential pressure—a vacuum that’s far higher in pressure than their current environment, and is created by intersecting water bodies as a result of opening a channel like a pipe. “Delta P is vacuum-like suction much like you would imagine from when the cabin of an airplane ruptures, but at a much greater magnitude,” Brian says. “It can be very difficult to detect until you are already too close, and can trap the diver at depth or even kill them instantly.” The unfortunate crab in the video above is an example of how differential pressure can ruin your day.

12. THEY SOMETIMES GO DIVING INSIDE WATER TOWERS.

Those water towers you see in populated areas that stand on stilts hundreds of feet up in the air? Townships need to periodically check them for sediment levels to maintain water quality. That’s when they call in a commercial diver, who needs to add "not afraid of heights" to their skill set. “You have to climb all the way up, get into your wet suit, measure the sediment with a ruler, and clear it out with a [suctioning device called an] airlift." Jeremy says. And that's not the only lofty prospect for a diver: Jeremy notes that some oil rigs stretch 100 feet in the air. Divers without seniority may be expected to carry out repairs or work at or near the top, instead of actually diving.

13. THEY CARRY KNIVES.

A diver straps on a knife
iStock

No, it’s not to duel with sharks. “While diving, I carry a razor-sharp knife for emergency purposes only,” Brian says. In an urgent situation, it could be used for "cutting anything from old fishing line to my own dive umbilical—the air hose and lifeline.” The latter rarely happens, unless the diver gets it snagged or it becomes compressed. In the event of a hose failure, divers have a "bailout bottle," a supplemental tank they can switch to in case of emergency.

14. THEY CAN BE UNDERWATER BUT NOT ACTUALLY IN THE WATER.

A diver works with a torch underwater
iStock

Not every dive requires divers to swim while working. For jobs that require meticulous attention to detail for repair or where welding is required, diving teams can set up positive pressure habitats that isolate the problem area and allow the diver to work out of water. “You use air pressure to push water out of the habitat, which is in two pieces,” Jeremy says. Inside, a diver would trade their helmet for a welding mask. Because it can take a day or more to set up the habitat for a job that might take only one or two hours, habitat work is used only in cases where there aren't any other options.

15. THEY STILL GO SWIMMING FOR FUN.

Like anything done recreationally, diving can begin to seem routine if it's performed on a daily basis. While some divers get their fill of water by working 12-hour days for weeks at a stretch, some still enjoy going under in their free time. “While my career has definitely diminished the novelty of being in such an alien environment, I still love to dive recreationally,” Brian says. “Commercial diving is exhausting work, typically in dark, low-visibility water with a particular task in mind, while recreational diving is often more about exploration and sight-seeing. I would argue that the difference is not unlike a professional runner going on a beautiful hike in their free time.”

12 Secrets of Dollar Store Employees

A dollar store in Brooklyn
A dollar store in Brooklyn
Spencer Platt/Getty Images

Discount retailers have probably been around as long as commerce itself, but it wasn't until the 1950s that a string of stores began popping up in the South that shared a common element: Everything they sold was dirt-cheap. In recent years, the country has experienced a wave of frugal storefronts selling everything from stationary to seafood. Stores like Dollar Tree, Family Dollar, Dollar General, and a rash of independently owned stores catering to the budget-conscious now outnumber Starbucks and McDonald's in the U.S.

To get a better sense of the activity that surrounds these wallet-friendly outlets, Mental Floss spoke to three employees of Dollar Tree. Here’s what they had to say about stocking their shelves, fanatical customers, and why they spend so much time filling up balloons.

1. Paper goods are the best deal in stores.

You can find practically anything at dollar stores, including frozen food (more on that in a moment), toys, and cleaning products. Assortments can vary widely by store and by franchise, but according to Brenda, the store manager of a Dollar Tree in the Midwest, customers get the best deal sticking with paper products. At least, that's what employees buy most frequently. “The items that my employees and I purchase at Dollar Tree for value would definitely be toilet paper, paper towels, birthday cards, candy, balloons, plastic ware, paper plates, envelopes, stationary products, and the daily newspaper,” she says. At her store, toilet paper and the local newspaper are the top sellers. While the former is a pretty obvious necessity, newspapers at her location are typically cheaper than in other stores; the Sunday edition in particular is up to two or three dollars cheaper. (Like a lot of their inventory, the chain likely gets a tremendous discount for buying the papers in bulk.)

2. They know you won't be in the store for too long.

The exterior of a Dollar Tree store is shown from a low angle
Joe Raedle, Getty Images

Dollar stores typically have little signage, few frills, and a small real estate footprint (Dollar General's is around 7300 square feet, or one-tenth the size of a Walmart). But having limited space with easily accessible items is by design—the average shopping trip for a Dollar General store is just 10 minutes. “Planning the store around fast trips is one good way to improve the fast experience many customers are looking for, while also keeping sales high by allowing customers to see many products,” says Hank, an assistant Dollar Tree store manager in Canada. Customers “tend to want to get in and out fast. They are often busy and have other plans for the day and don't want to spend too much time wandering the store.”

3. They want customers to feel like they’re on a treasure hunt.

According to Moody’s, an earnings and credit analysis firm, Dollar General rotates its inventory on a regular basis to make customers feel like they need to buy items now in case they’re not around later—perpetuating what it calls a "treasure hunt" feel. That helps the stores compete with online retailers like Amazon, which typically maintains stock of popular products and may not provoke the same sense of urgency in buyers.

Dollar Tree’s approach is slightly different. While new inventory does arrive from suppliers, it’s not as frequently. “When we are doing the truck we get really excited when we see a new product,” Brenda says. “We only see maybe 10 to 15 new things per week out of 1500 items that are coming off of the truck, so when we get something new we immediately cut open the box and examine it.”

4. They catch a lot of shoplifters.

You can walk out of dollar stores with an armful of goods for $20, $10, or less, but that still doesn’t deter people from swiping even the cheapest targets. “The shoplifting is ridiculously rampant,” Brenda says. “We catch someone just about every day.”

Oddly enough, the price may help facilitate the theft. “The thing with the low prices is that there is no real deterrent from people stealing since none of the products have any security around them," Brenda says.

5. They recommend you skip the steak.

A steak sits on a grill
A steak purchased somewhere other than a dollar store.
iStock.com/NightAndDayImages

Shopping for frozen foods at the discount chains can be hit or miss. Some items might be OK: “I’ve had the little pie slices, the sausage and pancake bites, and the Cinnabon bites are amazing,” Brenda says. “The frozen dinners are good as well. People also love the frozen vegetables and fruit.”

But when it comes to unprocessed food, like meat or seafood, you should probably consider a visit to the local grocer instead. “I don’t eat any of the frozen fish or rib eyes because I don’t trust frozen seafood or meat that costs a dollar,” she says.

Nate, a Dollar Tree manager in Minnesota, agrees. “I would never buy the steak,” he says. “I’ve heard from more than one person that it doesn’t cook [well] and it feels like rubber.” In 2016, television affiliate WCPO in Cincinnati attempted a taste test, serving up the four-ounce $1 ribeye along with a butcher's and supermarket cut to some area firefighters. Among the responses: "I guess it was meat" and "It's not terrible."

6. Other stores use them to stock up.

When most everything is a dollar, it’s easy to see why discount chains find themselves acting as a warehouse for local small businesses. Hank says that he’s observed independent proprietors coming in to stock up on items. “There is one man who runs a convenience store and buys boxes of chocolate bars and bottles of soda,” he says. “We also get plenty of event organizers buying supplies in bulk, sometimes hundreds of items at a time.”

7. They dread the sight of Hot Wheels toy cars.

A Hot Wheels toy car is pictured
iStock.com/CTRPhotos

While many toys at dollar store locations are of suspect quality, there’s at least one bit of inventory that causes a lot of excitement in aisles. “We get a lot of the infamous 'Hot Wheels Hunters,'” Nate says, referring to collectors of the popular die-cast toy car line from Mattel. “I guess they scour the internet and find out when stores are getting shipments. I’ve had people show up a day after my 2000-piece truck [arrives] and demand I go find the one box of Hot Wheels I got so they can be the first to buy them.”

If they’re polite, Nate will try to accommodate them. Some of the nicer Hot Wheels fans even deputize themselves as de facto employees. “The one guy that is a frequent visitor will take the boxes I have and stock them neatly on the shelves while he looks for what he wants," Nate says.

8. They sell pregnancy tests. And they’re reliable.

A home pregnancy test shows a positive result
iStock.com/nazdravie

If you’re wary of the accuracy of a home pregnancy test kit that costs $1, well, you probably should be. But according to Nate, his store stocks a reliable brand. “The pregnancy tests we sell are the same ones used in most hospitals,” he says. Most all pregnancy tests detect a hormone called human chorionic gonadotropin, or hCG, which is produced during pregnancy. More expensive tests can detect lower levels earlier in a pregnancy, while cheaper tests—like the ones in dollar stores—might not register a positive until a woman is a little further along.

But they're still effective. And according to Brenda and Nate, they're also among the most-stolen items in their stores.

9. Balloons keep them aloft.

Most Dollar Tree and many other dollar store locations have a counter devoted to mylar balloons intended for birthday parties and other events. That’s because the low cost and easy storage of the un-inflated balloons makes them a very profitable endeavor. “Balloons do a ton of business for Dollar Tree,” Brenda says. “A ton. Especially for big events.”

In a given week, her store might sell 150 to 200 balloons: “If you think about it, every day is someone’s birthday, baby shower, graduation, or anniversary.”

10. They might warn you away from a bad deal.

Shoppers browse the aisles of a dollar store
Spencer Platt, Getty Images

If you’re on the fence about whether or not a dollar purchase is worthwhile, you can always ask an employee. They might tell you if it’s worth the cash. “I know that the quality of our products is not always the best and I obviously am not going to constantly bring this up to customers, but I am not afraid to give them a bit of heads up when I know a certain item is especially poor, or could be found much cheaper at a competitor,” Hank says. “I know that the company will survive without those couple sales, and I prefer to make customers happy over adding a few more dollars to the wallet of the company.”

11. The store manager is often overworked.

Dollar Tree, Dollar General, and other chains have come under fire in recent years for tasking store managers with a lot of responsibility in order to keep the costs of staffing low. According to Nate, that checks out. “In my district they are trial-running having the stores unload the semi-trucks instead of the drivers," he says. "But they won’t give us the hours to add an extra guy, which means I’m the manager on duty while being in the back of a semi throwing 1800 cases."

12. They can’t keep Donald Duck on the shelves.

Bottles of Donald Duck orange juice line a store shelf
Ted Eytan, Flickr // CC BY-SA 2.0

In stores filled with a lot of unfamiliar brands, customers like to see one recognizable face: Donald Duck’s. The Disney character is front and center on Dollar Tree’s orange juice, and his smiling bill is one of the most popular items in the stores. (The drink is produced by Citrus World, which owns the Florida’s Natural label and licenses the Donald imagery and name from Disney.) “The Donald Duck orange juice is our third most-sold item,” Brenda says. “To be honest, I’m not sure why it’s so popular. A lot of people stop at our store on the way to work or wherever, so it’s kind of a quick pick-up.”

11 Secrets of Hollywood Science Advisors

AMC
AMC

The work of a Hollywood science advisor can be hard to spot. Rather than shoving science in the audience’s faces, it’s their job to make the world of a movie or TV show feel believable, from the physics of fight scenes to the theories that characters scrawl on the blackboard.

Science advisors are usually regular scientists working in fields like physics, astronomy, and chemistry; the main thing that often sets them apart from their peers is a passion for film and TV. Whether they're meeting with actors, checking equations, or shaping plot points, here are some of the ways they contribute to your favorite pieces of pop culture.

1. Science advisors are usually volunteers.

Most of the Hollywood science advisors that Mental Floss spoke to were doing the work pro bono. Donna Nelson, a chemist at the University of Oklahoma, learned that Breaking Bad was looking for a science advisor while reading an interview with the show’s creator, Vince Gilligan. According to him, the series was in need of guidance from a real scientist, but there wasn’t enough room in the budget to hire one. So Nelson volunteered to lend her knowledge.

That was in Season 1, and over the next several years Breaking Bad exploded into a massive success. But even as the budget grew, Nelson never once accepted a paycheck for her advising work. “I was a volunteer from beginning to end,” she tells Mental Floss. “I was delighted to do it because my goal was to help the scientific community.”

The same usually holds true even when the advisors contributing their expertise to a high-budget Hollywood blockbuster. James Kakalios, a physicist at the University of Minnesota and science advisor on such films as Watchmen (2009) and The Amazing Spider-Man (2012), tells Mental Floss, “All the consulting that I've done has been volunteering.”

2. Geeking out gets them noticed.

Before she became advisor on the TV show 12 Monkeys, Sophia Gad-Nasr, an astroparticle physicist at UC Irvine, was just a regular viewer talking about the episodes on social media. "I really liked it and I tweeted about it, so the showrunner reached out to me and let me know they were in need of a science advisor," she says.

Meanwhile, Kakalios was a comic book fan who had literally written the book on the physics of superheroes before he was asked to work on the Watchmen movie. "[Warner Bros.] contacted me and said 'We're making a movie about a comic book. Have you ever heard of this graphic novel called Watchmen?' And if you're into comic books, it's like saying 'Have you ever heard of this movie called Citizen Kane'?" he says. "So when I was done vibrating like a gong, I said 'Yes, I've heard of Watchmen.'"

3. They're sworn to secrecy.

Sean Carroll, a theoretical physicist at the California Institute of Technology, did some consulting on the upcoming movie Avengers 4—the entire plot of which has been kept tightly under wraps. He says, “I know things about that I’m not allowed to tell anybody. And they do make sure that you understand that.”

For 12 Monkeys, Gad-Nasr was hired to help introduce the Hartle-Hawking state—physicists Stephen Hawking and James Hartle's theory that prior to the Big Bang there was only space and no time—into the show. Her work ended up being one of the biggest spoilers of the series. “[In 12 Monkeys] you keep getting hints about this 'red forest,' and that red forest was actually the Hartle-Hawking state I worked on. I had to sign an NDA.”

4. They need to be on-call 24/7.

Scientists who sign on to advise a TV show shouldn’t expect normal working hours. The makers of the show might reach out to them whenever a science question comes up during filming, which can be any time of day or night. While working on Breaking Bad, Nelson knew that being able to answer emails quickly was crucial. “I tried to put myself in [the filmmakers’] place and thought of them being on set, and you know they’re not going to hold up filming for a science advisor,” she says. “They’re very busy … so if they don’t get an answer it will be easy for them to write the science out.”

5. They sometimes meet directly with actors.

A science advisor mainly works with writers, producers, and directors, but occasionally they'll meet with members of the cast. While consulting on Watchmen, Kakalios chatted with actor Billy Crudup to help develop his character, Dr. Manhattan, who’s a nuclear physicist. "We were talking about [Dr. Manhattan's] attitudes of being cut-off from humanity and I was talking to him about how as a director of graduate studies I often saw students get overwhelmed by graduate school," he says. "They can kind of shut down but the one thing they focused on exclusively is their work—it's the one thing they have control over. Later on he said he thought that was helpful."

6. They help make fictional scientists feel human.

The makers of Breaking Bad often asked Nelson what a chemist might do in certain situations, from the words they use to the way they interact with their students and peers. One of her insights into the psychology of Walter White became a major plot point in the series. “They asked, ‘If there was a person who was working alongside another person and one man would go on to be a Nobel Prize winner and the other would go on to become a high school teacher, what is something that could happen to make them take different paths?’ And I said, ‘Is there a young woman involved? Have the successful one take the girlfriend away from the other one and that would devastate him.’ And that’s exactly what they did.”

7. If you want to spot a science advisor’s work, check the blackboard.

One of the most common tasks science advisors are given is something most viewers never notice. If a movie or TV show contains a scene with a professor (or scientist, mathematician, etc.) in front of a blackboard, it’s the science advisor's job to make sure that whatever equations are behind him or her make sense.

“I spent three days on the set of the TV show Bones because they had a long set of sequences with writing on blackboards,” Carroll says. The character writing on the chalkboard in that episode was also a theoretical physicist, and Carroll was responsible for making sure the work was accurate.

Gad-Nasr was also called to set to double-check the math she had come up with for 12 Monkeys. “It wasn’t me who wrote it on the blackboard, but I just came by to make sure everything was cool.”

A blackboard full of nonsense can also be a sign of a film or TV show that doesn’t have a science advisor. Before signing onto Breaking Bad, Nelson noticed some bogus equations on the board in Walter White’s classroom in early episodes. “There were parts that weren’t accurate and I would have stepped up and said something,” she says. But she was able to make up for it later on when the makers of the show asked her to draw some alkene structures to feature on a blackboard. “A person who’s not paying attention might not see that, but a student who’s just had alkene as an undergrad in class or as a high school student taking organic chemistry—they may feel great to be able to look at the correct structures and not see something different from what they learned in class.”

8. Their advice can lead to rewrites ...

Much of a science advisor’s work boils down to small changes in the dialogue, but occasionally their input leads to more significant cuts. When working on Thor (2011), Carroll advised against one scene that depicted a character pushing another off a disc-shaped planet. “The problem is there’s no gravitational pull to pull you off the edge of the planet,” he says. “So scientifically that doesn’t quite make sense.” (On a disc-shaped planet, gravity would actually be working to pull you back to the center.)

9. ... But they usually try to keep changes minimal.

A scientist and director may disagree over the intricacies of superhero physics, but at the end of the day, a science advisor trusts that the filmmaker knows what’s best for their movie. When looking over scripts, Nelson says she made it her mission to keep the dialogue as intact as possible. “The [writers] knew how to write a successful script and I didn’t, so the number one thing I did not do was rewrite the page. So if there’s an incorrect word that’s a three-syllable word that starts with P, I would try to correct the sentence by substituting a different three-syllable word that started with P, because they in their writing might have a certain cadence in the sentence or alliteration or something like that that other people might miss, and I would always try not to destroy any of that.”

10. Their suggestions don’t always make it in.

No matter how much a filmmaker appreciates a science advisor’s input, they rarely choose science over story. “Very few movies or TV shows in the science fiction world try to be 100 percent accurate,” Carroll says. "Really they’re trying to tell a good story more than anything else.”

Nelson experienced this first-hand when she was asked for her opinion on one of the most famous examples of inaccurate science in Breaking Bad: Walt’s blue meth. “Vince [Gilligan] came and asked me, ‘What do you think about making the meth blue?’” she recalls. “And I said I wouldn’t do it, because meth is not blue, it’s white. He said ‘Isn’t there any reason why it might be blue under some circumstances?’ I said no, it will always be white. And as you know, they went ahead and made it blue because it was necessary for them to have a trademark for his meth. It was a plot device.”

11. More filmmakers are using them.

When the makers of Breaking Bad first brought Nelson on as a science advisor in 2008, hiring her was a bit of an experiment. "When I first started working, I was told in so many words that there was a rumor in Hollywood that you couldn’t have a hit show with a science advisor," she says. Today, working with a scientist is standard even in movies and TV shows with minimal scientific themes. Part of the job's growing prevalence can be credited to the Science and Entertainment Exchange, a program that connects entertainment industry professionals to scientists.

Another explanation is that today's media consumers hold filmmakers to higher standards. "I think there’s an increasing sophistication among the audience and you can’t just have any old thing happen," Carroll says. "We live in a generation post Cosmos and Brief History of Time where there are a lot of moviegoers who are very smart about what is plausible, and they want their plots to make sense."

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