Why You Don't Think Your Friend's Boyfriend Is Cute

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There’s an explanation for why you and your best friend can never agree on whether a romantic interest is hot or homely.

According to a new study, it’s our life experiences—not a perfectly chiseled jaw or sultry bedroom eyes—that make a person’s face appealing to us. Sure, symmetrical features are generally more attractive than non-symmetrical ones, but an even face only partially accounts for someone’s overall “attractiveness,” researchers find. After that, our tastes can vary dramatically.

The two-part study, published this week in the journal Current Biology, asked 35,000 people to visit a website, where they were asked to rate faces for attractiveness. The resulting data showed that most individuals agreed only half of the time.

Was this because genetics and environment influence our perceptions of physical beauty? In the study's second half, researchers studied the facial preferences of 547 pairs of identical twins and 214 pairs of same-sex fraternal twins. Sure enough, fraternal twins—who grew up in the same households yet share 50 percent of the same genes—ended up disagreeing on standards of attractiveness. However, the identical twins were also “really, really different from each other in their facial aesthetic preferences,” one of the paper’s lead researchers, Jeremy Wilmer of Wellesley College, told Time.

In short, physical attraction is highly personal—even among relations who've had similar upbringings. Researchers chalked up the differences to our own distinct life experiences, which can vary widely thanks to co-workers, peers, past relationships, and media exposure.

If experience influences attraction, then what types of experiences make us prefer one face to another? The paper didn’t measure this, but researchers think it has to do with positive associations, as study lead author Laura Germine, of Massachusetts General Hospital, told Time. If you’ve had good experiences with people who have certain facial characteristics, you’ll most likely find them attractive. As time passes, others who look like them will seem good-looking to you as well. 

[h/t Time]

Lítla Dímun: The Smallest of the Faroe Islands Has Its Very Own Cloud

While some islands are known for their unusual geography or unique history, Lítla Dímun is notable for its weather. The island, which is the smallest of Denmark's Faroe Islands chain, is often capped by a lens-shaped cloud, making it resemble a scene from a fairytale.

According to Mental Floss's own Kerry Wolfe writing for Atlas Obscura, the cloud floating above Lítla Dímun is a lenticular cloud. This type of cloud forms when moist air flows over a protruding geological feature, like a mountain top. When the wind moving up the landmass hits the air current directly above it, a sort of wave is created on the downwind side of the mountain. The moist air falling down this wave evaporates and then condenses into a large, flying-saucer-shaped cloud atop the mountain peak as a result.

Another factor that makes Lítla Dímun distinct is that it's the only one of the 18 main Faroe Islands without human inhabitants. Visitors to the mystical location will instead find a thriving population of sheep. Originally, Lítla Dímun was home to a group of feral sheep likely dating back to the Neolithic era. But they were hunted to extinction in the 19th century. Domesticated sheep were introduced there around the same time, and today, farmers visit the island once a year to round up their flocks.

One of the few signs of human life are the ropes farmers use to scale the cliff faces bordering the island. Even if you have rock-climbing skills, Lítla Dímun may be dangerous to visit. A boat ride to the rocky shore is only possible when the surrounding sea is calm.

[h/t Atlas Obscura]

Why Are Sloths So Slow?

Sloths have little problem holding still for nature photographers.
Sloths have little problem holding still for nature photographers.
Geoview/iStock via Getty Images

When it comes to physical activity, few animals have as maligned a reputation as the sloth. The six sloth species, which call Brazil and Panama home, move with no urgency, having seemingly adapted to an existence that allows for a life lived in slow motion. But what makes sloths so sedate? And what horrible, poop-related price must they pay in order to maintain life in the slow lane?

According to HowStuffWorks, the sloth’s limited movements are primarily the result of their diet. Residing mainly in the canopy vines of Central and South American forests, sloths dine out on leaves, fruits, and buds. With virtually no fat or protein, sloths conserve energy by taking a leisurely approach to life. On average, a sloth will climb or travel roughly 125 feet per day. On land, it takes them roughly one minute to move just one foot.

A sloth’s digestive system matches their locomotion. After munching leaves using their lips—they have no incisors—it can take up to a month for their meals to be fully digested. And a sloth's metabolic rate is 40 to 45 percent slower than most mammals' to help compensate for their low caloric intake. With so little fuel to burn, a sloth makes the most of it.

Deliberate movement shouldn’t be confused for weakness, however. Sloths can hang from branches for hours, showing off some impressive stamina. And because they spend most of their time high up in trees, they have no need for rapid movement to evade predators.

There is, however, one major downside to the sloth's leisurely lifestyle. Owing to their meager diet, they typically only have to poop once per week. Like going in a public bathroom, this can be a stressful event, as it means going to the ground and risking detection by predators—which puts their lives on the line. Worse, that slow bowel motility means they’re trying to push out nearly one-third of their body weight in feces at a time. It's something to consider the next time you feel envious of their chill lifestyle.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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