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12 Surprising Effects of Daylight Saving Time

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Every March, clocks “spring forward” across much of the United States, robbing people of one precious hour of sleep. While hearing those same people complain about being tired is one not-so-surprising effect of Daylight Saving Time, the possibility of a longer prison sentence for those going before a judge on “sleepy Monday” is less expected. Here are 12 surprising effects of Daylight Saving Time—the good, the bad, and the scientifically ambiguous.

1. INCREASED SPENDING

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In 2016, JP Morgan Chase decided to look into the economic consequences of Daylight Saving Time (DST) by examining Los Angeles and Phoenix, two cities that are large, relatively close to each other, and have stable weather. Critically, Phoenix doesn’t observe DST while Los Angeles does [PDF].

Among their findings, DST was “associated with a 0.9 percent increase in daily card spending per capita in Los Angeles at the beginning of DST.” Perhaps more surprising, the end of DST was associated with a per capita daily spending reduction of 3.9 percent.

2. A HIGHER RISK OF HEART ATTACKS

Many studies have shown that DST is associated with an increase in heart attacks, with one study showing a 24 percent increase in the number of heart attacks on the Monday after DST at a group of Michigan hospitals. According to the University of Michigan, Mondays are bad for heart attacks in general (researchers believes the stress of beginning a new workweek and changes to the sleep-wake cycle are the reason why), but DST makes everything worse. Interestingly, the Tuesday following the end of DST was associated with a 21 percent drop in patients.

3. MISSED APPOINTMENTS

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Somewhat relatedly, a 2017 study found that the percentage of missed medical appointments increased significantly following DST. But as with heart attack risk, the missed appointments decreased in the fall—at least temporarily.

4. MORE CAR ACCIDENTS ... MAYBE (AT LEAST FOR A FEW DAYS)

Another field where studies aren't as consistent as one might expect is traffic accidents. In 2001, an American study found that there was a significant increase in accidents on the Monday after the shift to DST. A 2018 New Zealand study echoed the sentiment, finding that on the first day of DST road accidents increased 16 percent. In contrast, a Swedish study found that DST didn’t have any important effect in that country.

Of course, there’s more to DST than just those first couple days. After DST has gotten started, there’s more light on the road later in the day. Several studies have found this light reduces accidents substantially, so much so that one study concluded that a year-round DST would reduce motor vehicle occupant fatalities by 195 per year.

It’s so complicated that a 2010 analysis in Minnesota listed 10 studies that found positive effects of DST on road safety, and six studies that showed negative effects in both the spring and fall changes.

5. LONGER PRISON SENTENCES

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Researchers frequently use DST to study sleep deprivation in populations, as it’s a period of time when we all wake up an hour before we’re used to. One of these studies focused specifically on judicial punishment in U.S. federal courts [PDF]. The researchers looked at “sleepy Monday” (the Monday after the time change) and compared the sentence lengths to other Mondays. They found that on “sleepy Monday,” judges handed out 5 percent longer sentences. But don’t think you can get a lighter sentence during the fall switch; the researchers found no effect on sentencing at that time. But the researchers point out that this probably isn’t limited to judges—even managers may find themselves in the mood for doling out harsher punishments.

6. MORE MINING INJURIES

According to one study of mining injuries from 1983 to 2006, the Monday directly after the switch to DST was associated with 5.7 percent more workplace injuries and 68 percent more workdays lost because of injuries, indicating that there are more injuries that are more severe after the switch [PDF]. There isn’t, however, a corresponding decrease in the fall.

7. FEWER KOALA COLLISIONS

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One study decided to look at how DST affected human-wildlife interaction, specifically koala-vehicle collisions [PDF]. Because koalas are largely nocturnal, they often cross the road in the evening or at night. By shifting traffic patterns to times when it wasn’t dark, the researchers found that DST could “decrease collisions with koalas by 8 percent on weekdays and 11 percent at weekends” (although the difference between weekend and weekdays wasn’t significant, the researchers proposed that a slight increase in morning collisions lessened the benefit during the weekday). The researchers hope that further study can be done on human-animal interactions and DST.

Koalas aren’t the only ones crossing a road that benefit from DST; pedestrians might be safer as well. One study found “no significant detrimental effect on automobile crashes in the short run” and in the long run was associated with “a 8 to 11 percent fall in crashes involving pedestrians ... in the weeks after the spring shift to DST.” Meanwhile another study found that a year-long DST would mean 171 fewer pedestrian fatalities a year.

8. DECREASED SATISFACTION WITH LIFE IN GENERAL (AND INCREASED USE OF THE WORD TIRED)

In both the UK and Germany, studies have shown that life satisfaction deteriorates in the first week after the switch to DST in the spring. One study even quantified the deterioration in Germany with money. For the entire sample, the cost was calculated to be €213 (about $262), but for people in full employment—with relatively inflexible schedules—that increases to €332 ($408). And for the men in the sample, the cost of transition was €396 ($487).

Meanwhile, a Facebook analysis looked at the "feelings" people were sharing on the platform. On the Monday after the start of DST, the use of the word tired increased by 25 percent, with similar increases for “sleepy” and “exhausted” (as well as “wonderful” and “great”). In just the period from 5 a.m. to 12 p.m. on Monday, “feeling tired” usage increased an average of 86 percent, from a 12 percent increase in the non-DST Arizona up to a 231 percent increase in Delaware. By Thursday, “tired” is back to normal.

9. SLEEPIER KIDS (MAYBE)

The studies surrounding DST and school children are surprisingly inconclusive. On the one side, a 2009 article in Sleep Medicine looked at 469 Germans from 10 to 20 years old and divided them up into ‘larks’ (those who go to bed early and wake up early) and ‘owls’ (those who go to bed late and wake up late). They found that after the DST transition the group was sleepier for three weeks after the transition, with owls showing higher daytime sleepiness, and proposed that tests shouldn’t take place in the week following the switch over to DST.

A 2017 article in Economics of Education Review, however, looked at 22,000 Europeans students and found that, at least for low-stakes tests, the effect wasn’t statistically significant.

10. MORE CYBERLOAFING ON THE JOB

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Another study looked at people’s Google search trends for the Mondays before the switch to DST, immediately after the switch, and a week after, with a specific focus on sites like Facebook, YouTube, and ESPN (i.e. entertainment sites that people probably aren’t Googling for their jobs). They found that on the Monday after the switch, people searched for 3.1 percent more entertainment websites than the Monday before DST, and 6.4 percent more than the subsequent Monday. While the researchers caution they can’t be sure this was all "cyberloafing," the fact that there was nothing else special about these Mondays meant it very likely was [PDF].

11. MISTIMED INSULIN SHOTS

It might seem that in this age of smartphones and connected devices that figure it all out, the twice-yearly ritual of finding all the clocks to change is a thing of the past. But that’s not necessarily true. In a 2014 article in the Journal of Diabetes Science and Technology, the authors pointed out an easy clock to miss: insulin pumps. Because most commercial pumps aren’t GPS-enabled and lack internal time change mechanisms, they have to be manually set up. The study authors discuss an international college student with an insulin pump that came from a country that didn’t observe DST, meaning the clock was an hour off. They say that no significant harm resulted, but it just serves as a reminder to make sure you check all your clocks.

12. HIGHER ENERGY BILLS

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One of the main rallying cries for DST is that it saves energy, but studies have been mixed. In 1975 the Department of Transportation issued a report about whether a short-lived, year-long DST experiment had been worthwhile [PDF]. They declared “modest overall benefits might be realized by a shift from the historic six-month DST system,” but cautioned that these benefits were difficult to isolate. Optimistically, though, they said DST might help reduce 1 percent of electricity use.

But as modern researchers have noted, electricity usage has shifted since then. Chief among the changes: Only 46 percent of the new single family households completed in 1975 had air conditioning, compared to 93 percent in 2016 [PDF].

Indiana provided a good place to test this change, because in 2006 they decided to observe DST as an entire state (individual counties had observed DST before). A study ultimately concluded that while DST does save electricity in lighting, this is more than offset by increased demands for heating and cooling, resulting in Indiana households being hit by $9 million per year in higher electricity bills [PDF]. However, the study only looked at residential electricity consumption, not commercial or industrial.

Around the same time, the Department of Energy also looked into DST and found that during a four-week extension, electricity use decreased about half a percentage point per day. Ultimately, Stanton Hadley at the Oak Ridge National Laboratory told Live Science, “I could see the answer being either way.”

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35 Movies Roger Ebert Really Hated
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When Roger Ebert hated a film, he didn't mince words. On what would have been the Pulitzer Prize-winning writer's 76th birthday, here are some movies he absolutely loathed (including a couple of surprises) and his dry assessments of their value.

1. ARMAGEDDON (1998) // 1 STAR

“The movie is an assault on the eyes, the ears, the brain, common sense and the human desire to be entertained. No matter what they’re charging to get in, it’s worth more to get out. ... Armageddon reportedly used the services of nine writers. Why did it need any? The dialogue is either shouted one-liners or romantic drivel. ‘It’s gonna blow!’ is used so many times, I wonder if every single writer used it once, and then sat back from his word processor with a contented smile on his face, another day’s work done.”

2. THE BROWN BUNNY (2003) // 0 STARS

"I had a colonoscopy once, and they let me watch it on TV. It was more entertaining than The Brown Bunny."

When the movie’s director responded by mocking Ebert’s weight, Ebert said, “It is true that I am fat, but one day I will be thin, and he will still be the director of The Brown Bunny."

3. JASON X (2001) // HALF STAR

"'This sucks on so many levels.' Dialogue from Jason X; rare for a movie to so frankly describe itself. Jason X sucks on the levels of storytelling, character development, suspense, special effects, originality, punctuation, neatness and aptness of thought."

4. MAD DOG TIME (1996) // 0 STARS

"Mad Dog Time is the first movie I have seen that does not improve on the sight of a blank screen viewed for the same length of time. Oh, I've seen bad movies before. But they usually made me care about how bad they were. Watching Mad Dog Time is like waiting for the bus in a city where you're not sure they have a bus line  ... Mad Dog Time should be cut into free ukulele picks for the poor."

5. THE USUAL SUSPECTS (1995) // 1.5 STARS

"Once again, my comprehension began to slip, and finally I wrote down: 'To the degree that I do understand, I don't care.' It was, however, somewhat reassuring at the end of the movie to discover that I had, after all, understood everything I was intended to understand. It was just that there was less to understand than the movie at first suggests."

6. DEUCE BIGALOW: EUROPEAN GIGOLO (2005) // ZERO STARS

"[The title character] makes a living prostituting himself. How much he charges I'm not sure, but the price is worth it if it keeps him off the streets and out of another movie. Deuce Bigalow is aggressively bad, as if it wants to cause suffering to the audience. The best thing about it is that it runs for only 75 minutes ... Speaking in my official capacity as a Pulitzer Prize winner, Mr. Schneider, your movie sucks."

7. MR. MAGOO (1997) // HALF STAR

“Magoo drives a red Studebaker convertible in Mr. Magoo, a fact I report because I love Studebakers and his was the only thing I liked in the film. Mr. Magoo is transcendently bad. It soars above ordinary badness as the eagle outreaches the fly.”

8. SPICE WORLD (1997) // HALF STAR

"Spice World is obviously intended as a ripoff of A Hard Day's Night which gave The Beatles to the movies ... the huge difference, of course, is that the Beatles were talented—while, let's face it, the Spice Girls could be duplicated by any five women under the age of 30 standing in line at Dunkin' Donuts."

9. GOOD LUCK CHUCK (2007) // 1 STAR

"There is a word for this movie, and that word is: Ick."

10. FREDDY GOT FINGERED (2001)// 0 STARS

"This movie doesn't scrape the bottom of the barrel. This movie isn't the bottom of the barrel. This movie isn't below the bottom of the barrel. This movie doesn't deserve to be mentioned in the same sentence with barrels."

11. CORKY ROMANO (2001) // HALF STAR

Corky Romano is like a dead zone of comedy. The concept is exhausted, the ideas are tired, the physical gags are routine, the story is labored, the actors look like they can barely contain their doubts about the project.”

12. CHARLIE'S ANGELS (2000) // HALF STAR

Charlie’s Angels is like the trailer for a video game movie, lacking only the video game, and the movie.”

13. MANNEQUIN (1987) // HALF STAR

“A lot of bad movies are fairly throbbing with life. Mannequin is dead. The wake lasts 1 1/2 hours, and then we can leave the theater. Halfway through, I was ready for someone to lead us in reciting the rosary.”

14. EXIT TO EDEN (1994) // HALF STAR

“I’m sorry, but I just don’t get Rosie O’Donnell. I’ve seen her in three or four movies now, and she generally had the same effect on me as fingernails on a blackboard. She’s harsh and abrupt and staccato and doesn’t seem to be having any fun. She looks mean. ...  What were your first thoughts the first time Rosie turned up in the leather dominatrix uniform? Did you maybe have slight misgivings that you were presiding over one of the more misguided film projects of recent years?”

15. HOCUS POCUS (1993) // 1 STAR

“Of the film’s many problems, the greatest may be that all three witches are thoroughly unpleasant. They don’t have personalities; they have behavior patterns and decibel levels. A good movie inspires the audience to subconsciously ask, ‘Give me more!’ The witches in this one inspired my silent cry, ‘Get me out of here!’”

(What can we say? Ebert was occasionally wrong.)

16. TOMMY BOY (1995) // 1 STAR

“No one is funny in Tommy Boy. There are no memorable lines. None of the characters is interesting, except for the enigmatic figure played by Rob Lowe, who seems to have wandered over from Hamlet. Judging by the evidence on the screen, the movie got a green light before a usable screenplay had been prepared, with everybody reassuring themselves that since they were such funny people, inspiration would overcome them.”

17. THE VILLAGE (2004) // 1 STAR

“Eventually the secret of Those, etc., is revealed. It’s a crummy secret, about one step up the ladder of narrative originality from It Was All a Dream. It’s so witless, in fact, that when we do discover the secret, we want to rewind the film so we don’t know the secret anymore. And then keep on rewinding, and rewinding, until we’re back at the beginning, and can get up from our seats and walk backward out of the theater and go down the up escalator and watch the money spring from the cash register into our pockets.”

18. THE LOVE GURU (2008) // 1 STAR

“Myers has some funny moments, but this film could have been written on toilet walls by callow adolescents. Every reference to a human sex organ or process of defecation is not automatically funny simply because it is naughty, but Myers seems to labor under that delusion. He acts as if he’s getting away with something, but in fact all he’s getting away with is selling tickets to a dreary experience.”

19. SHE'S OUT OF CONTROL (1989) // 0 STARS

“What planet did the makers of this film come from? What assumptions do they have about the purpose and quality of life? I ask because She’s Out of Control is simultaneously so bizarre and so banal that it’s a first: the first movie fabricated entirely from sitcom cliches and plastic lifestyles, without reference to any known plane of reality.”

20. SUMMER SCHOOL (1987) // HALF STAR

“You see it, you leave the theater, and then it evaporates, leaving just a slight residue, something like a vaguely unpleasant taste in the memory.”

21. CLIFFORD (1994) // HALF STAR

“It’s not bad in any usual way. It’s bad in a new way all its own. There is something extraterrestrial about it, as if it’s based on the sense of humor of an alien race with a completely different relationship to the physical universe. The movie is so odd, it’s most worth seeing just because we’ll never see anything like it again. I hope.”

22. NORTH (1994) // 0 STARS

"I hated this movie. Hated hated hated hated hated this movie. Hated it. Hated every simpering stupid vacant audience-insulting moment of it. Hated the sensibility that thought anyone would like it. Hated the implied insult to the audience by its belief that anyone would be entertained by it."

Alan Zweibel wrote this film, and he got a chance to confront Ebert about the review. In a bathroom.

23. 200 CIGARETTES (1999)// HALF STAR

"Maybe another 200 cigarettes would have helped; coughing would be better than some of this dialogue."

24. DEATH TO SMOOCHY (2002) // HALF STAR

"In all the annals of the movies, few films have been this odd, inexplicable and unpleasant."

25. SAVING SILVERMAN (2001) // HALF STAR

"Saving Silverman is so bad in so many different ways that perhaps you should see it, as an example of the lowest slopes of the bell-shaped curve."

He included a critique of Neil Diamond, who makes a guest appearance in the movie: "As for Neil Diamond, Saving Silverman is his first appearance in a fiction film since The Jazz Singer (1980), and one can only marvel that he waited 20 years to appear in a second film, and found one even worse than his first one."

26. THE JAZZ SINGER (1980) // 1 STAR

From rogerebert.com:

"Diamond's whole presence in this movie is offensively narcissistic. His songs are melodramatic, interchangeable, self-aggrandizing groans and anguished shouts, backed protectively by expensive and cloying instrumentation. His dramatic presence also looks over-protected, as if nobody was willing to risk offending him by asking him to seem involved, caring and engaged.

"Diamond plays the whole movie looking at people's third shirt buttons, as if he can't be bothered to meet their eyes and relate with them. It's strange about the Diamond performance: It's not just that he can't act. It's that he sends out creepy vibes. He seems self-absorbed, closed off, grandiose, out of touch with his immediate surroundings."

27. ACE VENTURA: PET DETECTIVE (1994) // 1 STAR

"Most of the people look as if they would rather be in other movies. The movie basically has one joke, which is Ace Ventura's weird nerdy strangeness. If you laugh at this joke, chances are you laugh at Jerry Lewis, too, and I can sympathize with you even if I can't understand you. I found the movie a long, unfunny slog through an impenetrable plot. Kids might like it. Real little kids."

28. STOP! OR MY MOM WILL SHOOT (1992) // HALF STAR

"Stop! Or My Mom Will Shoot! is one of those movies so dimwitted, so utterly lacking in even the smallest morsel of redeeming value, that you stare at the screen in stunned disbelief. It is moronic beyond comprehension, an exercise in desperation during which even Sylvester Stallone, a repository of self-confidence, seems to be disheartened."

29. THE DUKES OF HAZZARD (2005) // 1 STAR

"Of course you don't have to be smart to get into The Dukes of Hazzard. But people like Willie Nelson and Burt Reynolds should have been smart enough to stay out of it. Here is a lame-brained, outdated wheeze about a couple of good ol' boys who roar around the back roads of the South in the General Lee, their beloved 1969 Dodge Charger. As it happens, I also drove a 1969 Dodge Charger. You could have told them apart because mine did not have a Confederate flag painted on the roof."

30. GODZILLA (1998) // 1.5 STARS

"Going to see Godzilla at the Palais of the Cannes Film Festival is like attending a satanic ritual in St. Peter's Basilica. It's a rebuke to the faith that the building represents. Cannes touchingly adheres to a belief that film can be intelligent, moving and grand. Godzilla is a big, ugly, ungainly device to give teenagers the impression they are seeing a movie."

31. THE BUCKET LIST (2007) // 1 STAR

"The Bucket List is a movie about two old codgers who are nothing like people, both suffering from cancer that is nothing like cancer, and setting off on adventures that are nothing like possible. I urgently advise hospitals: Do not make the DVD available to your patients; there may be an outbreak of bedpans thrown at TV screens."

32. DIRTY LOVE (2005) // 0 STAR

"I would like to say more, but—no, I wouldn't. I would not like to say more. I would like to say less. On the basis of Dirty Love, I am not certain that anyone involved has ever seen a movie, or knows what one is."

33. BATTLEFIELD EARTH (2000) // HALF STAR

"This movie is awful in so many different ways. Even the opening titles are cheesy. Sci-fi epics usually begin with a stab at impressive titles, but this one just displays green letters on the screen in a type font that came with my Macintosh. Then the movie's subtitle unscrolls from left to right in the kind of 'effect' you see in home movies."

34. THE FLINTSTONES IN VIVA ROCK VEGAS (2000) // HALF STAR

"This is an ideal first movie for infants, who can enjoy the bright colors on the screen and wave their tiny hands to the music."

35. PINK FLAMINGOS (1972) // 0 STARS

"John Waters' Pink Flamingos has been restored for its 25th anniversary revival, and with any luck at all that means I won't have to see it again for another 25 years. If I haven't retired by then, I will. ... Note: I am not giving a star rating to Pink Flamingos because stars simply seem not to apply. It should be considered not as a film but as a fact, or perhaps as an object."

Reviews via RogerEbert.com.

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14 Bold Facts About Bald Eagles
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Bald eagles are powerful symbols of America—but there’s a whole lot more to these quirky birds.

1. YOUNG BALD EAGLES AREN'T BALD.

A young bald eagle with a brown head on a beach.
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So obviously adult bald eagles aren't really bald, either—their heads have bright white plumage that contrasts with their dark body feathers, giving them a "bald" look. But young bald eagles have mostly brown heads. In fact, for the first four or five years of their lives, they move through a complicated series of different plumage patterns; in their second year, for instance, they have white bellies.

2. BALD EAGLES SOUND SO SILLY THAT HOLLYWOOD DUBS OVER THEIR VOICES.

A red-tailed hawk.
A red-tailed hawk's screech is usually dubbed over the bald eagle's weaker scream.
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It's a scene you’ve probably seen countless times in movies and on TV: an eagle flies overhead and emits a rough, piercing scream. It's a classic symbol of wilderness and adventure. The only problem? Bald eagles don't make that sound.

Instead, they emit a sort of high-pitched giggle or a weak scream. These noises are so unimpressive that Hollywood sound editors often dub over bald eagle calls with far more impressive sounds: the piercing, earthy screams of a smaller bird, the red-tailed hawk. If you were a fan of The Colbert Report, you might remember the show's iconic CGI eagle from the opener—it, too, is making that red-tailed hawk cry. Listen for yourself and decide who sounds more impressive.

3. THEY EAT TRASH AND STOLEN FOOD.

Two bald eagles guard their prey against two magpies on a snowy field.
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Picture a majestic bald eagle swooping low over a lake and catching a fish in its powerful claws. Yes, bald eagles eat a lot of fish—but they don't always catch it themselves. They've perfected the art of stealing fish from other birds such as ospreys, chasing them down until they drop their prey.

Bald eagles will also snack on gulls, ducks, rabbits, crabs, amphibians, and more. They'll scavenge in dumpsters, feed on waste from fish processing plants, and even gorge on carrion (dead, decaying animals).

4. BALD EAGLES USUALLY MATE FOR LIFE.

Two bald eagles perched on a tree.
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Trash and carrion aside, they're pretty romantic animals. Bald eagles tend to pair up for life, and they share parenting duties: the male and the female take turns incubating the eggs, and they both feed their young.

5. … AND THEY LIVE PRETTY LONG LIVES.

Two bald eagles sitting on a rock.
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Those romantic partnerships are even more impressive because bald eagles can survive for decades. In 2015, a wild eagle in Henrietta, New York, died at the record age of 38. Considering that these birds pair up at 4 or 5 years of age, that's a lot of Valentine's Days.

6. THEY HOLD THE RECORD FOR THE LARGEST BIRD'S NEST.

Two bald eagles in their large nest.
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Bald eagles build enormous nests high in the treetops. The male and female work on the nest together, and this quality time helps them cement their lifelong bond. Their cozy nurseries consist of a framework of sticks lined with softer stuff such as grass and feathers. If the nest serves them well during the breeding season, they'll keep using it year after year. And, like all homeowners, they can't resist the thought of renovating and adding to their abode. Every year, they'll spruce it up with a whopping foot or two of new material.

On average, bald eagle nests are 2-4 feet deep and 4-5 feet wide. But one pair of eagles near St. Petersburg, Florida, earned the Guinness World Record for largest bird’s nest: 20 feet deep and 9.5 feet wide. The nest weighed over two tons.

7. FEMALES ARE LARGER THAN MALES.

Two bald eagles in their large nest.
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In many animal species, males are (on average) larger than females. Male gorillas, for example, dwarf their female counterparts. But for most birds of prey, it's the opposite. Male bald eagles weight about 25 percent less than females.

Scientists aren't sure why there's such a size difference. One reason might be the way they divide up their nesting duties. Females take the lead in arranging the nesting material, so being bigger might help them take charge. Also, they spend longer incubating the eggs than males, so their size could intimidate would-be egg thieves.

If you're trying to tell male and female eagles apart, this size difference may help you—especially since both sexes have the same plumage patterns.

8. TO IDENTIFY THEM, LOOK AT THE WINGS.

A bald eagle flies across the water.
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People often get excited about a big soaring bird and yell "It's an eagle!” just before it swoops closer and … oops, it's a vulture. Here's a handy identification tip. Bald eagles usually soar with their wings almost flat. On the other hand, the turkey vulture—another dark, soaring bird—holds its wings up in a shallow V shape called a dihedral. A lot of large hawks also soar with slightly raised wings.

9. THEY'RE COMEBACK KIDS.

Baby eagle chicks in a nest.
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Before European settlers arrived, bald eagles were abundant across the U.S. But with settlement came habitat destruction, and the settlers viewed the eagles as competition for game and as a threat to livestock. So many eagles were killed that in 1940 Congress passed an act to protect the birds.

Unfortunately, another threat rose up at about that time. Starting after World War II, farmers and public health officials used an insecticide called DDT. The chemical worked well to eradicate mosquitos and agricultural pests—but as it traveled up the food chain, it began to heavily affect birds of prey. DDT made eagle eggshells too thin and caused the eggs to break. A 1963 survey found just 471 bald eagle pairs in the lower 48 states.

DDT was banned in the early 1970s, and conservationists began to breed bald eagles in captivity and reintroduce them in places across America. Luckily, this species made a spectacular recovery. Now the lower 48 states boast over 9700 nesting pairs.

10. THEY'RE UNIQUELY NORTH AMERICAN.

An African fish eagle flies over the water.
The African fish eagle is a relative of the North American bald eagle.
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You've probably heard of America's other eagle: the golden eagle. This bird lives throughout much of the northern hemisphere. But the bald eagle is only found in North America. It lives across much of Canada and the U.S., as well as northern parts of Mexico.

Though it may be North American, the bald eagle has seven close relatives that are found throughout the world. They all belong to the genus Haliaeetus, which comes—pretty unimaginatively—from the Latin words for "sea" and "eagle." One relative, the African fish eagle, is a powerful symbol in its own right. It represents several countries; for example, it's the national symbol of Zambia, and graces the South Sudanese, Malawian, and Namibian coats of arms.

11. THEY'RE AERIAL DAREDEVILS.

A bald eagle carries a fish off in its talons.
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It seems too weird to be true: While flying, bald eagles sometimes grab each other's feet and spin while plummeting to the Earth. Scientists aren't sure why they do this—perhaps it's a courtship ritual or a territorial battle. Usually, the pair will separate before hitting the ground (as seen in this remarkable set of photographs). But sometimes they hold tight and don't let go. These two male bald eagles locked talons and hit the ground with their feet still connected. One subsequently escaped and the other was treated for talon wounds.

12. THEIR EYES ARE AMAZING.

Close-up of a bald eagle's face.
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What if you could close your eyes and still see? Besides the usual pair of eyelids, bald eagles have a see-through eyelid called a nictitating membrane. They can close this membrane to protect their eyes while their main eyelids remain open. The membrane also helps moisten and clean their eyes.

Eagles also have sharper vision than people, and their field of vision is wider. Plus, they can see ultraviolet light. Both of those things mean the expression "eagle eye" is spot-on.

13. THEY MIGRATE … SORT OF.

A bald eagle sits in a snowy tree.
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If you're a bald eagle that nests in northern Canada, you'll probably head south for the winter to avoid the punishing cold. Many eagles fly south for the winter and return north for the summer—as do plenty of other bird species (and retired Canadians). But not all bald eagles migrate. Some of them, including individuals in New England and Canada's Maritime provinces, stick around all year. Whether or not a bird migrates depends on how old it is and how much food is available.

14. THEY CAN SWIM … SORT OF.

A bald eagle
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There are several videos online—like the one above—that show a bald eagle swimming in the sea, rowing itself to shore with its huge wings. Eagles have hollow bones and fluffy down, so they can float pretty well. But why swim instead of soar? Sometimes, an eagle will swoop down and grab an especially weighty fish, then paddle it to shore to eat.

Note that the announcer in the video above says that the eagle's talons are "locked" on a fish that's too heavy to carry. In fact, those lockable talons are an urban legend.

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LIVE SMARTER