How You View This Optical Illusion Might Reveal Your Age

Decades before "the dress" broke the internet, an optical illusion called “My Wife and My Mother-in-Law" had people second-guessing their eyesight. It depicts two images hidden in one illustration: The first shows a young woman turning her face away from the viewer, and the second shows the profile of a much older woman looking to the left. While both perceptions are technically accurate, the way you see the picture may give away your age, according to a study reported by indy100.

The study, published recently in Scientific Reports, looked at 393 subjects of varying ages. Researchers found that the youngest 10 percent of participants were more likely to see the young woman first when shown the illusion, while the oldest 10 percent of participants saw the old woman first.

Research has shown that people spend more time processing the faces of people they consider to be members of their "group" than those outside of it. "The effect of in- and out-groups may be particularly relevant to the processing of faces of different ages," the authors wrote of the study. "A common finding within the field is the own-age bias, where recognition memory is better for faces closer to one’s own age compared to other ages."

“My Wife and My Mother-in-Law" is an example of an ambiguous image or reversible figure—optical illusions that your brain can interpret one of two ways. These pictures are satisfying once you figure them out, but other optical illusions aren't so easy to outsmart.

[h/t indy100]

Costco Is Selling Enormous Tubs of Your Favorite Gluttonous Delights—Here Are 5 of Them

iStock.com/mphillips007
iStock.com/mphillips007

Costco's grocery department is perhaps the only place in America where you can get a $5 rotisserie chicken, a $1.50 hot dog and soda combo, and 7-pound bucket of Nutella all under one roof. The tub of hazelnut spread isn't the only food you can buy in bulk, either. Whether you're catering a wedding on a budget or restocking your doomsday shelter, here are five foods you can buy online—and in some stores—that come in outrageous portions.

1. A nearly 7-pound tub of Nutella

Sometimes, a small jar of Nutella just won't do. For those who can't get enough of the chocolatey hazelnut spread, Costco offers a bigger size—to the tune of 6.6 pounds. It costs $22, which is about $14 cheaper than splurging on 14 smaller jars weighing 7.7 ounces apiece. As Thrillist points out, in-store deals are only available to Costco members, but anyone can take advantage of discounts when they order online.

2. 23 pounds of macaroni & cheese

If bathing in macaroni and cheese is on your bucket list, now's your chance. Costco offers a $90 tub filled with 23 pounds of elbow macaroni and cheddar sauce mix, all of which comes in a "heavy duty" 6-gallon bucket. With enough food to serve 180 people, it's designed to last up to 20 years "if stored in a dry, cool environment"—so yes, it's bunker-approved. (Although, sadly, it's currently out of stock.)

3. A lifetime supply of honey

Given the uncertain future of honeybees (and by extension, honey), it might not be a bad idea to stock up on the sweet, sticky stuff. Costco's 40-pound tub of GloryBee Clover Blossom Honey costs $127. Considering that a 48-ounce jar of honey costs $27 on GloryBee's website, this represents savings of more than $200.

4. Emergency rations of mashed potatoes

This bucket of food is explicitly designed for surviving rather than feasting, but who's to say that a sudden craving for mashed potatoes or mac and cheese isn't an emergency? Costco's Emergency Food kit contains a one-month supply of various foods, including oatmeal, cheddar cheese grits with green chilies, chicken-flavored vegetable stew, and a rice and orzo pilaf. It will set you back $115, but again, it has a shelf life of 20 years.

5. 60 servings of freeze-dried breakfast skillet

Mountain House's breakfast skillet comes in six coffee-sized cans rather than one oversized bucket, but it still serves the same purpose. For $160, you get 60 servings of scrambled eggs mixed with hash browns, pork sausage, peppers, and onions. Just be sure to add the right amount of water, unless you like your eggs runny.

Want More Pizza in Your Life? Order One 18-Inch Pie Instead of Two 12-Inch Pies

iStock.com/smpics
iStock.com/smpics

When ordering pizza for guests (or when throwing yourself a personal pizza party), it can be tempting to spring for two medium pies over one large one. It may end up being more expensive, but it also feels like the logical choice: Two 12-inch pies should give you more cheesy goodness per square inch than an 18-inch pie, right?

That may be what pizzerias want you to think, but as Fermat's Library recently illustrated on Twitter, it's not the case. One large, 18-inch pie boasts a full 28 more square inches of pizza than two small 12-inch pies, making the larger pie by far the better deal.

Even though the diameter of the large pizza is smaller than the combined diameters of the two medium pies, it still has a larger total area. To get the area of the circle, you have to square the radius (which is half of the diameter) and multiply that by pi (about 3.14). This means the area of an 18-inch pizza is 254 square inches, while the combined area of two 12-inch pies is only 226 inches.

The geometry required to calculate your pizza order isn't too complicated, but the tweet was apparently eye-opening enough to garner a viral response. Some people were thankful for the math tip, while others had trouble wrapping their heads around it. Mathematician Tamás Görbe pointed out that while an 18-inch pie technically gives you more food, two 12-inches pies give you 33.3 percent more crust—something to keep in mind if that's your favorite part.

In case you're looking for another excuse to order pizza, January 13 marked the start of National Pizza Week. Here are some facts about the beloved dish to celebrate the occasion.

[h/t Mashable]

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