One more limerick is not going to do any harm (or is it?). I'm not the author, except for line 1, which is my brainchild, and much better IMHO than the original ("there was a young woman named Bright"). After all, in a limerick about relativity, how could you not include the name of the person who dreamed it all up:Einstein got a terrible fright
when he traveled much faster than light.
He left in the day
in a relative way
and returned the previous night.