of all the records surely this one has a limit to how low it can go ?!?

The record has fallen by roughly a second in the last 100 years. So in 400 years people will be running it in 5.5 seconds

Bolt reckons he can do 9.4 before he is finished.

just checked online and seen that Florence Griffith-Joyner still holds the female record of 10.49 (by .16 of a second to second ever highest) that she set in 88. That has to be drugs...

And incidentally the second best time ever by a woman is Marion Jones also a druggie. After that the best time is 10.73.