Science

The air reeks so strongly of rotten eggs that tribal leader Wes Martel hesitates to get out of the car at an oil field on the Wind River Reservation in Wyoming. He already has a headache from the fumes he smelled at another oil field.

You walk into a room. There are people there, cars outside, dogs, phones ring, the radio is on, somebody coughs; it's the pleasant blur of a busy world, until something, someone catches your attention. Then you lean in, the other sounds fade back, and you focus. That's how listening works — for most of us.

Some rappers have an impressive ability to make up lyrics on the fly, in a style known as freestyle rap.

These performers have a lot in common with jazz musicians, it turns out.

Scientists have found artists in both genres are using their brains in similar ways when they improvise.

In 2009, Susannah Cahalan was a healthy 24-year-old reporter for the New York Post, when she began to experience numbness, paranoia, sensitivity to light and erratic behavior. Grasping for an answer, Cahalan asked herself as it was happening, "Am I just bad at my job — is that why? Is the pressure of it getting to me? Is it a new relationship?"

But Cahalan only got worse — she began to experience seizures, hallucinations, increasingly psychotic behavior and even catatonia. Her symptoms frightened family members and baffled a series of doctors.

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There's been plenty of discussion about head injuries in professional football, new equipment, new lawsuits and new rules as well. Inevitably, the conversation came to include high schools, most prominently when a school board member in - near Philadelphia proposed to end the football program. There's also been, sometimes, angry pushback. Last month, the discussion opened again in Dover, New Hampshire.

Scientists may have finally solved a problem that has plagued beer drinkers for ages: Insufficient foam resiliency.

As any beer drinker can tell you, a tall glass of lager without a white, foamy head on top just doesn't look right. And even if you start out with one, it can dissipate fast. And that's just sad.

Now, microbiologists have identified the specific gene in yeast responsible for a beer's head and they say this discovery can lead to stronger, longer lasting, more aesthetically pleasing foam on your favorite brews.

Some time ago, a man wearing jeans, cowboy boots and a hoodie drove a dirty Ford Explorer into a carwash in Fort Worth, Texas. As soon as the car came back clean, he got it filthy again, and drove to the next carwash. He did this with every single full-service carwash in town.

The man wasn't suffering from a strange mental disorder; Patrick Kinkade was a criminologist conducting an experiment.

Second of a two-part series. Read Part 1

California starts the ball rolling Wednesday on a controversial scheme to keep the planet from overheating. Businesses will have to get a permit if they emit greenhouse gases.

Some permits will be auctioned today; the rest are free. The big idea here is the state is putting a ceiling on emissions.

It's a gamble. And for this top-down climate plan to work, it has to usher in a greener, more efficient economy.

California begins a controversial experiment to curb climate change on Wednesday: The state will start rationing the amount of greenhouse gases companies can emit.

It's the most ambitious effort to control climate change in the country. Some say the plan will cost dearly; supporters say it's the route to a cleaner economy.

Here's how the climate deal works. Big companies must limit the greenhouse gases they emit — from smokestacks to tailpipes — and they have to get permits for those emissions. The clock starts Jan. 1.