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Bill Gates, Philanthropist

Bill Gates is the world's third-richest person, and the driving force behind the vastly-endowed Bill & Melinda Gates Foundation -- which is concerned primarily with global health and education issues. Two days ago, Gates gave a great talk on the problems his philanthropy is tackling. The talk is remarkable first because he's actually a terrific speaker and knows his topic...but also because he released a small swarm of mosquitoes into his audience:

"Now, malaria is, of course, transmitted by mosquitoes," said Gates. "I brought some here, so you could experience this. We'll let those roam around the auditorium a little bit." [Releases mosquitoes.] "There's no reason only poor people should have [this] experience."

The mosquitoes were not malarial, but still. Wow. Have a look at his talk to learn about the work Gates is doing on health issues around the world.

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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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