Tornado Alley (PROG)

[PegnVA]

I found this interesting...
Mark Kelly is six minutes older than his brother. But Scott Kelly says he’s actually a few milliseconds younger still, due to having spent 500 more days in space than his astronaut brother. Einstein’s special theory of relativity leads to a “twins paradox” in which someone moving at a high velocity, such as 17,500 mph in low Earth orbit, ages more slowly than a twin on Earth.