Shankar Vedantam

To err is human.

So is refusing to apologize for those errors.

From toddlers and talk show hosts to preteens and presidents, we all know people who have done stupid, silly and evil things, then squared their jaws and told the world they've done nothing wrong.

When Ohio Republican Sen. Rob Portman recently reversed his stance on gay marriage after his son came out as gay, he joined a tidal wave of Americans who have altered their views on the subject.

Vampires and monsters will be out in force tonight, but some of the darkest creatures out there might be your little angels inside those Halloween costumes.

Both athletes were U.S. swimmers, both were dripping wet after finishing an Olympics final, and both had just won medals.

The first said, "It's not my normal specialty. ... We went out there and raced tough – and just came up a little short."

The second had a beaming face. He said, "[I] swam my own race. And knew I had a lane, and had an opportunity, and I went for it. It worked out, you know, it's just awesome that I get to go on the podium tonight. Honestly, I'm really proud of myself!"