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Lessons in optimism from very ill children inspire pediatric oncologist Jim Olson in his hunt for better treatments for brain tumors.

Planthoppers are champion jumpers — launching themselves upward, hundreds of times their own height, in just a couple of milliseconds. They achieve this feat with the help of cog-like teeth on their legs — the first mechanical gear system ever found in nature.

The chemistry of dozens of streams and rivers across the U.S. is changing. Waters are becoming more alkaline — the opposite of acidic. And the reason is counterintuitive — researchers believe that acid rain is to blame.

The four top congressional leaders held a closed-door meeting Thursday to assess where they stand on the coming government funding and debt-ceiling deadlines. As has become typical in recent years, some conservative House Republicans appear to be the stumbling block with their insistence that any deal repeal or defund Obamacare.

Dolby, who invented some of the technologies that revolutionized film and sound recording, was instrumental in developing surround sound technology. Dolby had been living with Alzheimer's and was diagnosed with leukemia this summer.

Wal-Mart says its plans to open six stores in the nation's capitol are back on after the mayor vetoed a so-called living wage bill that targeted big box retailers. The focus now turns to the District's 13 member City Council. The bill passed in July with eight votes — nine are needed to override a veto.

Twitter announced via Tweet Thursday that it's launching its long awaited initial public offering. It will be the most high profile IPO since Facebook went public last year. But Twitter hopes to avoid the mishaps that's marred Facebook's stock market debut.

The Obama administration's decision not to challenge pot legalization in Washington and Colorado is reverberating in states where regulation of medical marijuana has been scant.

The brutal attack shocked the nation and led to changes in India's laws about violence against women and sexual assault.

Men's Wearhouse stocks are down 10 percent, CEO Doug Ewert thinks he knows the reason why. The fear of the number 13. He blames superstitious brides for postponing their weddings to avoid 2013.