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The Reinvent the Toilet Challenge asked engineers to dream up a replacement for the antiquated flush toilet. Michael Hoffmann and his team at Caltech responded with a solar-powered toilet that disinfects waste and reuses wastewater to flush. Better yet, it pumps out hydrogen gas for use in fuel cells.

Each year, you need a new influenza vaccination to protect against the ever-changing seasonal flu virus. Then there's more exotic influenza variants such as swine flu and avian flu. Gary Nabel, director of the Vaccine Research Center at the NIH, discusses the ongoing quest to develop one vaccine that could protect against all influenza variants at once.

The Government Accountability Office says that the Mine Safety and Health Administration (MSHA) used appropriate data and scientific methods in drafting new regulations aimed at limiting the amount of coal dust miners are exposed to at U.S. operations.

Laura Veirs, Mates of State and more contribute to an album encouraging children to pursue science.

DefCon Kids grew out of the largest, most important gathering of computer hackers on the planet. This camp encourages kids to take a hard, skeptical look at the machines that surround them, and teaches them to hack apart everything they can lay their hands on.

There's a lot at stake in the fall election, including control of Congress and the White House. But important questions will also be decided at the state level. Ballot initiatives will let voters in several states decide on issues ranging from same-sex marriage to marijuana legalization.

Over the past year, Russia has run a campaign against what it calls "homosexual propaganda."

The chocolate cups filled with oozy marshmallow have been around for eight decades. They're made by the Sifers family, whose legend holds that the gooey treats were created by a candy maker who imbibed a bit too much vanilla.

A deadly occupation at Wounded Knee, S.D., in 1973 left a legacy of violence. Now a U.S. attorney is re-examining 45 related deaths that tribal officials believe had the backing of the FBI.

NPR's Scott Simon says voters and candidates might benefit if more politicians took real vacations — if they went somewhere, for at least a short time, where no one knows them. Where they don't have to ask for votes, money or spout talking points.