NASA Delays Robot Mars Life-Search Mission Dec 4, 2008 NASA said on Thursday that it will postpone by two years the planned launch of a major mission to study whether Mars was ever capable of harboring life, citing development and testing delays.

European Origin May Up Latinas' Breast Cancer Risk Dec 4, 2008 Among United States Latinas, a greater degree of European genetic ancestry is associated with an increased risk of breast cancer, the results of a new study indicate.

Climate History May Explain Empires' Fall Dec 4, 2008 An analysis of rings on a stalagmite from a cave near Jerusalem reveals a drier climate in the region at a time in history when the Roman and Byzantine empires were in decline, scientists reported on Thursday.