"Twilight of the Neandertals": Paleoanthropologists now know more about our closest genetic relatives - than any other extinct humans. But the reason for their demise is a growing mystery.
"What Now for Nuclear Waste?": The options - some of them controversial - for disposing of nuclear material.
"Surprises from Celiac Disease": A study of the potentially fatal food-triggered disease has uncovered a process that many contribute to treating many autoimmune disorders.
"A New Kind of Drug Target": An emerging class of medicines works its magic by targeting unusual sites on biological molecules.