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Republican presidential candidate Mitt Romney has accepted the scientific consensus that the planet is warming up. But he has not accepted another element of that consensus: that humans are largely responsible. His position is well-grounded in politics, but not so in logic.

How much vitamin D is enough vitamin D? And when should you add supplements to the diet? Doctors still disagree on the specifics, but some studies suggest that more isn't always better.

Democrats and Republicans are on track to spend about $1 billion each on TV advertising in the presidential race — most of it negative and almost all in battleground states. There's little evidence the ads sway voters, but the campaigns are happy to settle for low odds, given the lingering memories of the close 2000 election.

The ornithomimus dinosaur was built like a 400-pound ostrich and lived about 75 million years ago. But recent research suggests the adult dinos had big, showy, colorful feathers with quills that were most likely used for sexual displays or courtship.

If you don't believe me, just ask Canada. They produce more oil than they can use — and they pay just as much as we do.

Plants can sometimes exhibit human-like behavior — some respond to music, smell other plants or seem to shrink away when touched. In fact, some would argue that greenery is sensitive enough to deserve rights.

"We're not trying to hype it," National Weather Service meteorologist Paul Kocin tells Bloomberg News. "What we're seeing in some of our models is a storm at an intensity that we have not seen in this part of the country in the past century."

The news is sure to be a hot topic on the campaign trail as President Obama and Republican challenger Mitt Romney push to the Nov. 6 election.

Activists say some civilians have been killed by gunfire, but that government forces are not attacking rebels from the sky so far today.

The appeals process may stretch the case beyond the statute of limitations. Meanwhile, Berlusconi is also on trial for allegedly paying for sex with a teenage girl and trying to cover it up.