Robin Marantz Henig

The music that was popular in your youth seems to be the music you recall most vividly - and most nostalgically - for the rest of your life. But so is the music that was popular in your parents' youth.

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.