Why can we not reach the speed of light?

we, as humans, cannot because we don't have the technology to go that fast, this is a very complex subject and to save myself time here is a link to someone who can explain much better than i

http://in.answers.yahoo.com/question/index?qid=201...

read the best answer, but like he states, you will be left with questions and a blurred idea on it

headlight joke belongs to Steven Wright

Only massless particles can travel at the speed of light - anything with mass would have infinite mass at C, so it's not possible - so says Einstein.

Mass changes as speed increases because you're running out of available speed and time (simply none available beyond C and the closer you get the more you've used up) so the only variable left to change is mass.

The variables in the equation must change to make the formula still work - so, speed, time and mass shift accordingly.

If you go through all of the equations, you wouldn't exist at that speed. I can't name all of the equations off the top of my head but, that's what would happen.