High school is a haunted house in April, when seniors act up because the end is near. Even those who hate school sometimes cling to the devil they know. And for the kids who love it, the goodbyes are hard to think about.

In 2001, President George W. Bush was condemned for politicizing science with his decision to limit federal funding for stem-cell research; in 2009 President Obama was praised for reversing it, even though his decision was arguably just as political.

Accidents at power plants are bad enough. But a leak from a bioreactor could be worse, since bacteria can learn new tricks when you're not looking.

Nancy Gibbs Quotes