If you were wondering why so many of the track and field athletes at the Olympics were wearing bright green shoes, here's why: they're all Nike athletes. And Nike has decided to go uniform across the globe on bright green shoes to grab your attention (and your dollars). It's probably working.
Light degrades the second it hits our atmosphere, making terrestrial astronomy and the search for dim or distant stars tricky. The Gran Telescopio Canarias observatory is the world's largest single-aperture optical telescope, and it's got some ingenious ways to compensate.