One pill makes you larger and one pill makes you small.
But the ones that mother gives you don't do anything at all.
;-)
Many of the conceptual problems with relativity would disappear if scientists would just turn the concept inside out. What we call the speed of light is actually the speed of the expansion of the universe. Light just goes along for the ride. The universal law is that nothing can travel faster than the universe itself. This eliminates the problem of inflation at the beginning of time being faster than the current speed of light.