Atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...

W e’ve all experienced the shift to and from daylight saving time—whether we like it or not. In decades past, we’d wake up to ...

Stiff winds blew over Canada’s Toronto Pearson Airport Monday afternoon as a slim aircraft, cleared by air traffic controllers to land, and its 80 passengers and crew moved to land on the tarmac as ...