Alix Spiegel

On a recent Friday night, 30 men and 30 women gathered at a hotel restaurant in Washington, D.C. Their goal was love, or maybe sex, or maybe some combination of the two. They were there for speed dating.

The women sat at separate numbered tables while the men moved down the line, and for two solid hours they did a rotation, making small talk with people they did not know, one after another, in three-minute increments.

The March issue of the medical journal Pediatrics features an editorial looking at gender identity disorder in children. Pediatricians apparently are seeing more young patients who express an interest in changing their gender.

In 2004, after an extensive review, the Food and Drug Administration issued a strong warning to doctors who prescribed antidepressants to teens and children.

Antidepressants, the FDA said, appeared to increase suicide among kids and teens. Doctors needed to be careful. The FDA even mandated that a "black-box warning," the strongest type, be placed on antidepressant packaging.

When I was 17 years old, I got so depressed that what felt like an enormous black hole appeared in my chest. Everywhere I went, the black hole went, too.

So to address the black-hole issue, my parents took me to a psychiatrist at Johns Hopkins Hospital. She did an evaluation and then told me this story:

Five months after the implosion of Enron, Feb. 12, 2002, Enron's chief executive, Ken Lay, finally stood in front of Congress and the world and placed his hand on a bible.

At that point everyone had questions for Lay. It was clear by then that Enron was the product of a spectacular ethical failure, that there had been massive cheating and lying. The real question was, how many people had been dishonest? Who was in on it?

New findings in the science of giving on why and when people donate reveals some counter-intuitive results.