Pigeons have a magnetic GPS in their brain

We're still working on understad how animals detect magnetic fields, but what's going on in their brains to make sense of it all? Researchers have discovered the part of pigeon's brain that can process magnetic signals they detect, and it's enough to direct them travelling across the globe. » 4/29/12 8:30am 4/29/12 8:30am

How many groups reached the Americas before Christopher Columbus?

In 1492, Christopher Columbus landed in what is now the Bahamas, changing the world forever. But was he first non-indigenous person to reach the Americas? Vikings got there before him, and possibly Polynesians too...and those are just the sane theories. » 3/30/11 9:22am 3/30/11 9:22am