How Long Can You Hold Your Breath?

1. 

2. A quick challenge, my friend.

    

   How long can you hold your breath?  And more important, how does your time compare to everyone else's?

    

   On the next page, I'll give you quick instructions on how to time yourself, using your computer's clock.  Then you'll enter the time, and I'll show you some neat graphs.

    

   That's it. Spread the word if you like my idea.

See the instructions