shortsample

Lasers are quite simply fantastic.

-you can use them to heat things up
-you can use them to cool things down
-you can use them to damage eyes
-you can use them to repair eyes
-write cds
-read cds
-surgery
-warfare

Here is an article about how awesome lasers and their new cousin Bose Einstein Condensation are

http://www.colorado.edu/physics/2000/bec/lascool1.html