text: the current world record of 100 meter dash is 9.77 secs. do you think humans can physicaly break 9.00 seconds? without drugs, doping, or anything illegal of course. not now, but some day in the future.  maybe 20 years, maybe 50, maybe 100.  many performances previously thought unreachable are now quite common - the 4-minute mile, sub 10-second 100 meters, etc.  athletic performances are continually improving, and i can think of no reason for that to stop.