How much information do you think exists in the entire world? Take a guess. Forget megabytes and gigabytes and terabytes and petabytes, even exobytes. We're talking zetabytes here or 10 to the 21st bytes. Take the number 10, put 21 zeroes after it, that's what you've got because one recent estimate says there may be around three zetabytes of digital information out there. That's over one trillion gigabytes. Just imagine all those hard drives piled up, and then imagine them not starting up when you plug them in.
This is SCIENCE FRIDAY, I'm Ira Flatow. We all know the phrase a dog is a man's best friend. But how did they become such loyal companions? Scientists agree that dogs descended from wolves, eventually evolving into the first domesticated animals, but that's where the consensus ends.
Researchers have been using archaeological records and genetic studies to tease out clues about how dogs and humans came to live together, but they seem to tell different stories of how it happened.
Originally published on Fri January 25, 2013 12:03 pm
Unusual activity in the atmosphere over the Arctic Circle is triggering snow and frigid temperatures across Canada, the U.S. and parts of Europe. Climatologist Jeff Weber, of the University Corporation of Atmospheric Research, explains why this winter could pack a punch.