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Synthetic biologist Jay Keasling has already taught yeast to make the leading anti-malarial drug. His next project takes the technology a step further, using yeast to turn plant waste into diesel — and maybe gasoline and jet fuel, too.

Tax fossil fuels in proportion to the amount of carbon they release. That's it; that's the whole plan.

This week President Obama announced his plan to tackle climate change, including proposals to regulate gas and coal emissions, and brace the nation for rising seas. David Roberts, who covers energy and climate change for Grist.org, talks about what to expect from the plan — and how much the president can accomplish without the help of Congress.

Bert and Ernie — yes, Sesame Street's Muppets — have been thrust yet again into the gay marriage debate.

Los Angeles International Airport has 30 comfort dogs assigned to assist weary and stressed-out travelers. The airports in San Jose and Miami are using dogs, too. Many passengers say it's helpful to see a smiling dog at the end of the security check-in.

The chief legal counsel for the Mexican American Legal Defense and Educational Fund is applauding Gov. Rick Perry for signing into law the interim voting…

The cable network presents two drama series this Sunday — series at different ends of their life spans. In its eighth and final season Dexter, starring Michael C. Hall, is worth sticking with, while Ray Donovan, starring Liev Schreiber unveils its very impressive first episode.

The U.S. 9th Circuit Court of Appeals lifted its injunction on gay marriages in California on Friday. They'd been on hold while the challenges to Proposition 8 worked their way through the appeals process.

A randonnée is a long-distance, self-supported bike ride. There are time limits — you can't go too slow or too fast — but it's not a race. It's about camaraderie and doing it yourself — and this approach to cycling is catching on in the U.S.

After this week's Supreme Court rulings on gay marriage, supporters and opponents are turning their attention to individual states, where several legislatures are expected to take up the issue.