European fears about the U.S. pulling its troops from the continent have been brewing for some time, with the head of the Munich Security Conference, Christoph Heusgen, saying: "The U.S. will likely ...

Researchers have systematically detailed, step by step, how cognitive maps form in the brain's hippocampus -- a region responsible for learning and memory.

Ukraine’s government wants to restore the country’s frontier to where it was before Russia launched its first invasion more than a decade ago. The U.S. defense secretary said that was “unrealistic.” ...