can someone explain please

just a couple of things that crossed my mind while reading a few posts about time travel and the speed of light.
can anyone tell me or direct me to a site that may explain these things in simple terms
what is it that propels light to move at the speed that it does and is it possible that there could be anything else that moves faster that we just can't comprehend.
also just out of interest can someone tell me how fast impulses can move through the nerves in the human brain.
I've reached the age of 32 (33 in 2 days) and it's only lately that I really wish that I'd really thought about things and asked more questions in my physics lessons at school.

ok never mind then I guess I'm on my own
I'll have to do a search then

This site does a good job explaining time travel.. in a theoretical sence
freespace.virgin.net...

Theory of Relativity. Something that helps you understand how gravity works on large objects
pratt.edu...

And the speed of light.. all around resource you could call it
www.what-is-the-speed-of-light.com...

thanks for the reply I will be checking out those sites right away

Here is a simplified explanation of time travel at the speed of light:
express.howstuffworks.com...

amazingly I have just turned my telly on and channel four has a programme on about einsteins theory of everything. very interesting stuff.

Time traveling is not possible. E=MC2 makes that when reaching the speed of light the mass becomes infinitive and all solves into pure energy.

www.space.com...

Singularitys (which could make E=MC2 impossible) probably don't exist either (no 0 dimensions).

You might want to try howthingswork.com... they probalby have some info there.