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Video Games Running on a Pen. That You Write With. A Pen.

From the "I Didn't Know They Could Put a Computer in That" department, apparently the Livescribe Echo™ Smartpen is a pen computer that runs software. No, it's not a tablet -- it's a computer inside a pen. Out of the box, the pen has handwriting/drawing recording, audio recording, a built-in display with clock, a speaker, and various apps. The thing even has an App Store. Um. So yeah, now your pen can be smart too. In my day, it was pretty sweet if your pen had a decent grip and a way to change the ink cartridge...soon, technophiles will be comparing tech specs on their pens. (This one is available in 4GB and 8GB models.)

Shown below: an enterprising programmer got his hands on one of these and built a Tic-Tac-Toe game, and then ported the classic text adventure Zork. Onto a pen. You write what you want to do, and the pen displays the text of its replies on its built-in screen. I'm going to go take a little future-shock nap now.

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Belly Flop Physics 101: The Science Behind the Sting
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Belly flops are the least-dignified—yet most painful—way of making a serious splash at the pool. Rarely do they result in serious physical injury, but if you’re wondering why an elegant swan dive feels better for your body than falling stomach-first into the water, you can learn the laws of physics that turn your soft torso a tender pink by watching the SciShow’s video below.

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What's the Saltiest Water in the World?
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Saltwater is common around the world—indeed, salty oceans cover more than two-thirds of the globe. Typical saltwater found in our oceans is about 3.5% salt by weight. But in some areas, we find naturally occurring saltwater that's far saltier. The saltiest water yet discovered is more than 12 times saltier than typical seawater.

Gaet’ale is a pond in Ethiopia which currently holds the record as the most saline water body on Earth. The water in that pond is 43.3% dissolved solids by weight—most of that being salt. This kind of water is called hypersaline for its extreme salt concentration.

In the video below, Professor Martyn Poliakoff explains this natural phenomenon—why it's so salty, how the temperature of the pond affects its salinity, and even why this particular saltwater has a yellow tint. Enjoy:

For the paper Poliakoff describes, check out this abstract.

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