Mark Udall

Some of the best times I've spent in Colorado have been in the backcountry with my mom and siblings, and more recently, with my own kids. That is why I'm concerned to see today's kids spending more time browsing the Internet than exploring nature.

What do cells do when they see a broken piece of DNA? Cells don't like such breaks. They'll do pretty much anything they can to fix things up. If a chromosome is broken, the cells will repair the break using an intact chromosome.