[UCANSEE2]

Did Einstein ever explain why, of all the various particles flying around the universe, photons are the fastest?

I agree with Presidio9.

Only particles with NO MASS can be propelled to the speed of light, in 'light' of Einstein's Mathematical Expression.

The less mass a particle has, the closer to the speed of light it can get.

The only question I have, is there some massless particle (or a particle with a negative mass) that can travel faster than the speed of light?

[MHGinTN]

Tachyons for your tea, sir?

[Lancey Howard]

The only question I have, is there some massless particle (or a particle with a negative mass) that can travel faster than the speed of light?

(shrug) There must be, or there wouldn't be any energy. Because, after all, energy is equal to mass times the speed of light squared.

[Errant]

Gravity or links between entangled particles, to name a few, are other “things” to consider, that may/do travel faster than C; but then these “things”, among others, are likely neither E nor M. :)

[Mycroft Holmes]

The only question I have, is there some massless particle (or a particle with a negative mass) that can travel faster than the speed of light?

The math of relativity tells us that in order to move faster than C you must have an imaginary (square root of -1) rest mass, whatever that means.

[Mom MD]

Or is there an alternate universe where the speed of light is the slowest a given particle can travel?