Talk of the Nation

Egypt is set to start rewriting its constitution in March, a year after the fall of president Hosni Mubarak in February 2011. During a visit to Egypt, Justice Ruth Bader Ginsburg said she "would not look to the U.S. Constitution if I were drafting a constitution in the year 2012."

Grammy Award-winning pop diva Whitney Houston died Saturday at the age of 48. Her voice inspired a generation of musicians. Houston's musical director and friend Michael Baker and bass player Matthew Garrison, who played on Houston's 2009-2010 final tour, share memories.

Reporting in Science, researchers write that an FDA-approved drug for skin cancer had surprising results in mice with Alzheimer's. The drug rapidly cleared up amyloid protein from the brain and improved cognitive function. Co-author Gary Landreth discusses the drug's potential as a therapy for Alzheimer's.

In his book The Science of Yoga: The Risks and the Rewards, New York Times science writer and long-time yoga practitioner William Broad investigates popular health claims about yoga--that it boosts metabolism, for example--and finds that scientific studies tell a different story.

Several times in earth's history continents have collided to form supercontinents only to later break apart. Geologist Ross Mitchell discusses a new study in Nature that predicts in 50 to 200 million years time the Americas and Eurasia will collide to form a supercontinent over the Arctic.