Jim Kelley wrote:
According to Einstein, anything with energy has mass equivalence -
especially photons. But other than that, nothing with mass can travel
at the speed of light.

Make that "nothing with *rest* mass can travel at the
speed of light". From an earlier posting of mine:

"Photons have zero rest mass. Otherwise, they couldn't
travel at the speed of light."
--
73, Cecil http://www.w5dxp.com