Surrey NanoSystems via CNET
Surrey NanoSystems via CNET

This Material Is So Dark, You Can't See It

Surrey NanoSystems via CNET
Surrey NanoSystems via CNET

If I were a supervillain, I’d want my name to be Vantablack. Unfortunately, that moniker is already taken, but not by a Hollywood bad guy. No, its owner is even more dark and mysterious: Vantablack is the darkest material ever made.

Created by a British company called Surrey NanoSystems, Vantablack absorbs all but 0.035 percent of visible light. It is grown on sheets of aluminum foil and consists of a bunch of microscopic carbon nanotubes so tightly packed together that light particles can’t escape. "Take one of the hairs on your head,” Ben Jensen, the chief technical officer of Surrey NanoSystems, explained to The Guardian. “Split that hair 10,000 times and one of the strands that you take away is the size of the tubes that we grow."

This material is so dark, it removes all texture from the surface to which it is applied. Human eyes don’t really know what to make of it. Here’s how Jensen explains what Vantablack does to crumpled aluminum foil: "You expect to see the hills and all you can see … it's like black, like a hole, like there's nothing there. It just looks so strange."

The visual void Vantablack produces reminds me of the Portable Holes from Wile E. Coyote cartoons. Indeed, Stephen Westland, professor of color science and technology at Leeds University, told The Independent that the material is “almost as close to a black hole as we could imagine."

So, why create something so dark? Vantablack will be used to help calibrate space cameras and telescopes. According to Jensen, “it reduces stray-light, improving the ability of sensitive telescopes to see the faintest stars.” And the military will no doubt want to get its hands on Vantablack for stealth operations, but Surrey NanoSystems is keeping quiet about that. It is also coy about disclosing Vantablack’s price, but says it’s “very expensive.”

(TRY TO) SEE FOR YOURSELF

For the next four months, Vantablack will be on display in London at the Science Museum.

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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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