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 distance more accurately than the best surveying equipment, and patch a tiny hole in a human eye better than the most careful stitch?
No, it’s not Superman. 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, warn us of earthquakes, and check nuclear weapons. And that’s just for starters.
