The Busy Beaver Challenge, a notoriously difficult question in theoretical computer science, is now producing answers so ...

Reporter covering climate change, energy and the environment. Chris Mooney writes about energy and the environment at The Washington Post. He previously worked at Mother Jones, where he wrote about ...

Grass is pretty easy going, aren't you grass? She likes sunbathing a lot. She's pretty clever, because she makes her own food, just from sunshine. That's called being a producer. So she doesn't need ...