Practicing activities that make you think (like crossword puzzles) could do a lot more than just improve your memory -- they just might lengthen your life a little too.

Any activity or game that requires you to concentrate will do the trick so you can pretty much take your pick, but if you're looking for something fun to practice on right now try taking this brain quiz and see how you do. An example from the quiz:

• Say "silk" six times. What do cows drink?
  

...

...

How did you do? Cows drink water, by the way, not milk (yeah, I totally fell for that one...). Happy concentrating!