You won't go broke betting on Einstein's ideas to hold up. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Albert Einstein's theory of special ...

BERLIN, Sept. 15 (UPI) --The speed of light is a constant. A new test -- the most precise test of a photon's speed -- confirms it. The results of the test support the concept of Lorentz symmetry, the ...