Proof of gravitational waves came on Sept. 14, 2015, when two giant, L-shaped, 2-mile-long laser instruments, one set up in a swamp in Louisiana and the other in Hanford, Washington, detected a tiny ...

Sound has a speed limit. Under normal circumstances, its waves can travel no faster than about 36 kilometers per second, physicists propose October 9 in Science Advances. Sound zips along at different ...

Review subduction zones and how earthquakes occur in these zones. (See Activity Answer for more information.) Draw a subduction zone on the board and review with students how the December 26, 2004, ...

One of the most controversial parts of modern physics is what it tells us about philosophy. Both quantum mechanics and special relativity have much to say on the limits of what can be casually related ...