Scientists measure the distance to the Moon by bouncing lasers off mirrors placed there by space probes and astronauts.

Humans use lots of different types of information to make sure we don't get lost. We can look out for familiar landmarks and ...

Two mathematicians have proved that a straightforward question — how hard is it to untie a knot? — has a complicated answer.

Google Maps estimates travel time using a blend of technology and data. It calculates distance, considers speed limits, and ...