A mind-blowing explanation of the speed of light

Light exists outside of time.

  • The only things that travel at the speed of light are photons.
  • Nothing with any mass at all can travel at the speed of light because as it gets closer and closer to the speed of light, its mass increases. And if it were actually traveling at the speed of light, it would have an infinite mass.
  • Light does not experience space or time. It's not just a speed going through something. All of the universe shifts around this constant, the speed of light. Time and space itself stop when you go that speed.

Is Walking or Standing on the Escalator Faster?

Do you walk up the escalator, or stand and let yourself be delivered to the top? One of these methods is more efficient than the other. 

Excellent escalator etiquette. (Photo credit ROSLAN RAHMAN/AFP/Getty Images)

Does your patience fizzle out when you're stuck behind slow walkers? How about those lazy standers who block the escalator on both sides? Well, a study on escalator travel has found that those side-by-side sloths who are making you miss your train are actually doing it right. You are in the wrong, Speedy Gonzales.

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