The world’s time, to which all clocks are set, comes from small national labs. Ukraine’s is in Kharkiv, a city under fire.

National Geographic Magazine’s annual photo contest is still under way, but the deadline for submissions is coming up on Friday.

A huge amount of urban traffic comes from cars circling for available parking. Robot fleets could change all that.

Americans don’t realize how fast the country is moving toward becoming a better version of itself.