If boomers were always looking to shock, millennials are eager to share.

Girls grow up scarred by caution and enter adulthood eager to shake free of their parents' worst nightmares. They still know to be wary of strangers. What they don't know is whether they have more to fear from their friends.

Harriet Tubman and Sojourner Truth were slaves by birth, freedom fighters by temperament.

There's a smartphone gait: the slow sidewalk weave that comes from being lost in conversation rather than looking where you're going.

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.

It's always been a luxury to be able to hop a plane to Paris, to Venice, to the Grand Canyon.