Two possible ways that life evolved in ice

We know the first single-celled organisms were swarming across the planet over 3.5 billion years ago. The big question is how the precursors of those cells made the jump from collections of chemicals to multicellular organisms. Two recent theories explain that it's all about ice. » 5/31/13 3:02pm 5/31/13 3:02pm

A Supermassive Ice Age May Have Led to Complex Life on Earth

There was a time on Earth, about 635 million years ago, when almost the entire planet was covered in ice. At least, this is the idea underlying the Snowball Earth Hypothesis, which holds that there was a massive ice age before the proliferation of complex, multicellular life. Though it's still controversial,… » 3/04/13 10:41am 3/04/13 10:41am