Science Want to live forever? A 90-year-old physics rock star is betting his remaining years on it. Ellsworth Toohey
animals Scientists have cloned the first endangered species in North America: a very cute ferret David Pescovitz
Science How an aborted fetus may have saved your life (and the lives of many other fetuses) Maggie Koerth
genetic engineering Meet the woolly mouse, the first step toward bringing back the woolly mammoth from extinction Allan Rose Hill