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

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...

For Mr. Santos, math can also inspire ideas about structures that have already been built — a new way to see and appreciate the world. Inspired by this idea, The New York Times created a virtual tour ...

OLED TVs I test TVs for a living — here are 3 reasons I’d splurge on OLED over a cheap TV TVs I make a living testing TVs — these are the 5 TVs under $1,000 I'd buy right now ...