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Nailing Bike Thieves in San Francisco

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Have you ever had your bike stolen? Meet your new best friend, Officer Matt Friedman of the SFPD. He sets out "bait bikes" and gleefully takes down bike thieves when they're stolen. If you ride a bike, you'll love this:

And yes, the bike-thief-shaming is already happening on Twitter. For example: this guy. You can read more from The New York Times, including this delicious tidbit:

“You should have seen his face — he thought he was in the clear,” said Officer Friedman, 41, who carries a .40-caliber Sig Sauer semiautomatic and an iPhone 5, which he used that day to take a picture of the severed bike lock. He then posted an image on Twitter with the message: Thank You 4 Taking Our Bait Bike.

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science
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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iStock // lucamato

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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