Tiny machines built from individual molecules are moving from science fiction into working hardware, promising to reshape ...

Objective To evaluate systematic reviews of randomised controlled trials (RCTs) on the effects of exercise on general cognition, memory and executive function across all populations and ages. Methods ...

A new study overturns previous findings that domestic cats originated thousands of years earlier. An African wildcat (Felis lybica) rests on a rock in Kruger National Park, South Africa. So far, ...

The power of the Executive Branch is vested in the President of the United States, who also acts as head of state and Commander-in-Chief of the armed forces. The President is responsible for ...