Looking Back on a Year in Science
What are your picks for the top science stories of 2012?
Explore Episode Segments
The comet ISON, discovered by two amateur astronomers last year, will zoom past Earth next fall. But where did it come from?
Scientists have cooled potassium gas to one billionth of a degree below absolute zero. But in the quantum world, that's actually "hotter" than the sun. How is that possible?