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The Gates Foundation has granted engineers more than $3 million to develop cheap, high-tech toilets that don't need water or electricity. To test these supercommodes, the foundation has purchased 50 pounds of soybean paste that resembles human waste.

In what could be the last podcast before Romney's V.P. announcement, NPR's Ron Elving and Ken Rudin once again review the finalists. Plus, a look at the latest Obama and Romney ads, more battleground state polls, primary results in Missouri and elsewhere, and a look ahead to the next Tea Party target.

A wave of states are implementing or considering laws that would require a government photo ID to vote. Some say the laws could disenfranchise voters, others say ID is required for basic needs. Host Michel Martin talks with journalist Kristal Brent Zook and Abigail Thernstrom of the U.S. Commission on Civil Rights.

Every nation that sent a delegation to the London Games sent at least one female athlete — a first for the Olympics. This year's Team USA has more female than male athletes — and the women have won nearly twice as many medals as the men: 100 total medals, by my count, to 59 for the men.

The Science Friday Book Club reconvenes this week to talk about Monkey Mind--writer Daniel Smith's personal account of his severe anxiety. Kirkus Reviews calls the book "a true treasure-trove of insight laced with humor and polished prose." Call in and share your review. Peer into the anxious mind of writer Daniel Smith with the SciFri Book Club.

What's with marketing food as a health miracle? The Center for Science in the Public Interest files the latest in a slew of complaints about the claims food companies make about their products.

The rocks, floating in the waters near New Zealand, must have been created by an underwater volcano. The floating mass is about 200 square miles larger than New Jersey.

Shark fin soup is a delicacy, but consumers may not be aware they're eating threatened species. Scientists hope the methods they've devised to trace shark DNA in bowls of soup can help law enforcement officials track contraband in states where sales are illegal.

American wrestler Jordan Burroughs has won the first and only U.S. gold medal in his sport at the London Games, beating Sadegh Saeed Goudarzi of Iran. Burroughs, the reigning world champion at the 74kg weight, won a point in the first two periods to put a quick end to the men's freestyle match.

Colorado Supporting Our Troops sends care packages to members of the military. The boxes contain everything from lip balm to licorice.