Our planet is sometimes called the big blue marble, but Professor Shiladitya DasSarma of the University of Maryland-Baltimore has a hypothesis that suggests if you look way back in time, Earth may have once been bright purple. Plus: meet a guitar with LEDs built into its body that can flash in time with the music.
We’re hearing a lot about how a research project has shown that Earth days used to be about a half-hour shorter than they are now. Why is our planet rotating more slowly now? It's mostly because of the moon. Plus: in Myrtle Beach, South Carolina, the National Shag Dance Championships are getting underway.