Science Headlines

• Stem Cells Turned into Precursors of Sperm and Eggs The breakthrough could ultimately lead to research that would help infertile couples.
• Recipe for Mass Extinction: Add Algae and Stir Controversy A new hypothesis claims toxins from algae played a major role in all five mass extinctions.
• 2012 Cataclysm: Ancient Astronomy to Modern Myth? Skeptic, Ben Radford, takes on three authors to calibrate the claims of planetary disaster in 2012.
• Cosmic Jewel Box Photographed in Detail Trio of images showcase stars of the Jewel Box cluster.
• Why We Carve Pumpkins, Not Turnips There are actual historical reasons that we carve pumpkins every Oct. 31.