WASHINGTON, Feb. 21 (Xinhua) -- U.S. President Donald Trump has of late added lumber and forest products to previously ...

WASHINGTON, Feb. 9 (Xinhua) -- U.S. President Donald Trump said on Sunday that he will announce new 25-percent tariffs on all steel and aluminum imports into the United States, with the official ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.