George Greenstein Blog
A Trip to Alpha Centauri
Conventional rocketry cannot do the trick. We need new technology
Posted: to General News on Sun, Feb 9, 2020
Updated: Sun, Feb 9, 2020
Fun Physics Puzzles
They’ve got me stumped -- how about you?
Posted: to General News on Sun, Feb 9, 2020
Updated: Sun, Feb 9, 2020
A tip for teachers
The incessant talker can be a problem
Posted: to General News on Sun, Feb 9, 2020
Updated: Sun, Feb 9, 2020