Why We Keep Falling for Fake News

Once upon a time, we believed there were two kinds of news: good news and bad news. Then the 2016 election rolled round, and we got a new category: "fake news." More and more of our social media feeds were taken up by spam accounts pushing misleading information or outright lies that many nevertheless believed were true. But why did—does—this automated campaign of deceit work on so many of us? A new study published in the journal Nature Human Behaviour says the bots are only partly to blame.

While "fake news" may be a buzzword, it's certainly no joke. The information we take in can change the way we think, behave, and vote. So scientists are working as fast as they can to understand, and ideally defuse, the phenomenon before it gains any more traction.

Some studies have found that viral ideas arise at the intersection of busy social networks and limited attention spans. In a perfect world, only factually accurate, carefully reported and fact-checked stories would go viral. But that isn’t necessarily the case. Misinformation and hoaxes spread across the internet, and especially social media, like a forest fire in dry season.

To find out why, researchers created a virtual model of information-sharing networks. Into this network, they dropped two kinds of stories: high-quality (true) and low-quality (fake or hoax). Then they populated the networks with actual users and news outlets and spam bots. To keep the virtual news feeds close to real life, the spam bots were both more numerous and more prolific than the genuine posters.

The results confirmed what any Facebook user already knows: Whether or not a story goes viral has very little to do with whether it's actually true. "Better [stories] do not have a significantly higher likelihood of becoming popular compared with low-quality information," the authors write. "The observation that hoaxes and fake news spread as virally as reliable information in online social media … is not too surprising in light of these findings."

Within the model, a successful viral story required two elements: a network already flooded with information, and users' limited attention spans. The more bot posts in a network, the more users were overwhelmed, and the more likely it was that fake news would spread.

Even conscientious media consumers can be taken in by false information if they're in a rush, the authors write. "The amount of attention one devotes to assessing information, ideas and opinions encountered in online social media depends not only on the individual but also on [their] circumstances at the time of assessment; the same user may be hurried one time and careful another."

So what's the solution? "One way to increase the discriminative power of online social media would be to reduce information load by limiting the number of posts in the system," they say. "Currently, bot accounts controlled by software make up a significant portion of online profiles, and many of them flood social media with high volumes of low-quality information to manipulate public discourse. By aggressively curbing this kind of abuse, social media platforms could improve the overall quality of information to which we are exposed."

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'Lime Disease' Could Give You a Nasty Rash This Summer
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A cold Corona or virgin margarita is best enjoyed by the pool, but watch where you’re squeezing those limes. As Slate illustrates in a new video, there’s a lesser-known “lime disease,” and it can give you a nasty skin rash if you’re not careful.

When lime juice comes into contact with your skin and is then exposed to UV rays, it can cause a chemical reaction that results in phytophotodermatitis. It looks a little like a poison ivy reaction or sun poisoning, and some of the symptoms include redness, blistering, and inflammation. It’s the same reaction caused by a corrosive sap on the giant hogweed, an invasive weed that’s spreading throughout the U.S.

"Lime disease" may sound random, but it’s a lot more common than you might think. Dermatologist Barry D. Goldman tells Slate he sees cases of the skin condition almost daily in the summer. Some people have even reported receiving second-degree burns as a result of the citric acid from lime juice. According to the Mayo Clinic, the chemical that causes phytophotodermatitis can also be found in wild parsnip, wild dill, wild parsley, buttercups, and other citrus fruits.

To play it safe, keep your limes confined to the great indoors or wash your hands with soap after handling the fruit. You can learn more about phytophotodermatitis by checking out Slate’s video below.

[h/t Slate]

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Why Eating From a Smaller Plate Might Not Be an Effective Dieting Trick 
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It might be time to rewrite the diet books. Israeli psychologists have cast doubt on the widespread belief that eating from smaller plates helps you control food portions and feel fuller, Scientific American reports.

Past studies have shown that this mind trick, called the Delboeuf illusion, influences the amount of food that people eat. In one 2012 study, participants who were given larger bowls ended up eating more soup overall than those given smaller bowls.

However, researchers from Ben-Gurion University in Negev, Israel, concluded in a study published in the journal Appetite that the effectiveness of the illusion depends on how empty your stomach is. The team of scientists studied two groups of participants: one that ate three hours before the experiment, and another that ate one hour prior. When participants were shown images of pizzas on serving trays of varying sizes, the group that hadn’t eaten in several hours was more accurate in assessing the size of pizzas. In other words, the hungrier they were, the less likely they were to be fooled by the different trays.

However, both groups were equally tricked by the illusion when they were asked to estimate the size of non-food objects, such as black circles inside of white circles and hubcaps within tires. Researchers say this demonstrates that motivational factors, like appetite, affects how we perceive food. The findings also dovetail with the results of an earlier study, which concluded that overweight people are less likely to fall for the illusion than people of a normal weight.

So go ahead and get a large plate every now and then. At the very least, it may save you a second trip to the buffet table.

[h/t Scientific American]

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