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In recent years, the Microsoft co-founder has pulled back from his work at the company to focus on his foundation — improving global health and reducing poverty. But his hands-on days at Microsoft are not over. Gates is stepping down as chairman but moving into a part-time role as technology adviser.

Tyrone Hayes, a biology professor at the University of California, Berkeley, has spent the past 15 years to studying the adverse effects of atrazine, a common herbicide used in the U.S. For much of that time, Hayes believed he was being watched and closely followed by Syngenta, the Swiss company that produces the chemical, in an effort to discredit his findings. Audie Cornish talks to New Yorker reporter Rachel Aviv for more.

This week, Kacey Bellamy is in Sochi with the U.S. Olympic women's hockey team. Before she headed to Russia, though, she reflected a moment on the love and sacrifices of her family, without which she never would have made it so far.

A broken stormwater pipe in North Carolina has sent the waste into the Dan River, which flows through Virginia and out into the Atlantic. Officials say the drinking water is safe, but environmental questions linger.

Because of an influx of trains hauling crude oil and other freight across the Northern Plains, Amtrak is facing problems with unreliability, long delays, lost revenue and stranded passengers. An advocacy group wants the government to intervene.

Members of the Russian performance-protest-collective called Pussy Riot are speaking out against the Russian government and inhumane prison conditions. In 2012, three of the group's members were imprisoned for staging a raucous anti-Putin protest in a Russian Orthodox cathedral in Moscow. They have since been released, and are using their voices to attract people to their cause.

Smokers are shrugging off the announcement that CVS will stop selling tobacco products. The company announced the move on Wednesday as part of a strategy to promote healthy choices. But more than half of cigarettes are sold at gas stations, so the company's decision is unlikely to have much of an impact on access to tobacco.

Chobani, a Team USA sponsor, has decorated its containers of Greek yogurt in honor of the Olympics. But shipments of Chobani haven't made it to Sochi. Russian officials say the company failed to complete the necessary paperwork to allow the yogurt to enter the country.

Apparently, just imagining what's happening on the written page isn't enough. A new wearable device uses temperature controls and lighting to mimic the experiences of a story's protagonist.

It was annual Senate retreat day in Washington Wednesday, a time when senators get away from the U.S. Capitol and all its daily distractions. But not too far away.