A multiverse may be a natural prediction of the physical theories that define the beginning of the universe.
A woman's body goes through a number of changes in the initial stages of pregnancy. Here are 12 common early signs of pregnancy.
The UN says temperatures were "more befitting the Mediterranean than the Arctic."
NASA is tracking two explorers on a 2,268-mile (3,650 kilometers) journey across Antarctica to learn more about humanity's ability to survive on Mars.