Some concepts in science are so world-altering - so profound - that almost everyone knows what they are, even if they don’t fully understand them. Einstein’s most famous equation, E = mc^2, falls into that category, stating that the energy content of a massive body is equal to that object’s mass times the speed of light squared. Just in terms of units, that makes sense: energy is measured in Joules, where a Joule is a kilogram · meter squared per second squared, or a mass multiplied by a velocity squared. But there could have been any sort of constant in there as well: a factor of 2, π, ¼, etc. Things could have been a little different, if only our Universe were a little different. Yet somehow,