Here’s a riddle: What can be sharper than the sharpest razor and hotter than the hottest torch? What can bore holes in diamonds, measure distances better than the best surveying equipment, and patch a tiny hole in a human eye better than the most careful stitch?
If you guessed Superman, guess again. It’s a laser. In the operating room, doctors use lasers to cut tissue, destroy tumors, and erase scars and birthmarks. In supermarkets, laser scanners read prices on bar codes. Lasers track flying objects for the military. They warn us of earthquakes. They even check nuclear weapons. And that’s just for starters.
