The residents of Clayton, Missouri, can expect fewer sunburns at the pool this summer, thanks to a timely and brilliant idea from a local high school student.

16-year-old Lynly Brennan raised about $1,600 to install sunscreen dispensers at three community pools to the delight of many her neighbors (and, presumably, their dermatologists).

One of the sunscreen dispensers. Photo via Patty DeForrest.

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Family

"How does solar energy work when there's no sun?" has been a question for pretty much about as long as solar energy has been a thing.

Of course people wouldn't want solar panels on their houses if installing them meant that, come sunset, the movie they were watching suddenly shut off, forcing them to read by candlelight like colonial settlers. Making solar power a viable option, even when the sun sets or disappears behind some clouds, was one of the first things scientists and engineers had to figure out.

Photo by Andreas Rentz/Getty Images.

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Heroes

How fast is a star?

Though the stars in the sky seem pretty fixed, they're actually all moving relative to each other. You just can't tell because they're so far away. Even the constellations are only temporary — in another 50,000 years, they may look very different!

No two stars are moving the exact same way, either. Some move at very different speeds, which means that while some stars are like this:

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Heroes