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This year, seven states have passed new, tighter voter I.D. laws. Supporters say they protect the integrity of elections, but critics say they could keep minorities and poor people from voting. Host Michel Martin hears both sides of the issue with law professor Spencer Overton and the Heritage Foundation's Hans von Spakovsky.

How do skyscrapers withstand 100-mph winds? How does air circulate inside tall buildings? And what happens when you flush a toilet on the 100th floor? Those questions and more are answered by Kate Ascher in her new book exploring the inner workings of skyscrapers.

Grease rustling is on the rise, as thieves make off with used restaurant grease. The goo left over from deep-fat frying is prized on the biofuels market. As fuel prices go up, so does the price of recycled grease.

All U.S. troops are set to withdraw from Iraq by the end of this 2011, and many believe Iran will move to assert more influence over Baghdad. But Ray Takeyh, senior fellow at the Council on Foreign Relations, argues that Iran has already lost Iraq.

A nationwide poll found that 45 percent of people thought the health of Americans had become worse during the past five years, and 40 percent thought it had stayed about the same. Only 13 percent thought it was better.

Catherine McKinley traveled through nine West African countries a decade ago to track the history of indigo, the blue dye that was made very valuable by the African slave trade. Host Michel Martin speaks with McKinley about her book Indigo: In Search of the Color that Seduced the World.

Dr. Conrad Murray faces up to four years in prison and a likely revocation of his medical license.

Robert Siegel talks with NPR's Karen Grigsby Bates about Monday's verdict in the trial of Dr. Conrad Murray. Michael Jackson's personal physician was found guilty.

A new Pew report finds a widening age gap in economic well-being. Older adults are significantly better off than a quarter century ago, while the median net worth of households headed by younger adults has fallen dramatically.