Alaskan
0
- Joined
- Jan 29, 2014
- Messages
- 12,031
- Points
- 113
Here's one:
How Far Can Laser Light Travel?
(Inside Science) -- Have you ever played with a pocket-sized laser, wondering how far its light would travel? Could you, a naughty student inside a classroom on Earth, annoy a poor substitute teacher on Mars by waggling your laser pointer at him?
www.insidescience.org