The first part of your question — how stellar objects reach millisecond spin periods — involves two concepts. First, the object needs to be small, since no material can move faster than the ...

Special relativity is beyond weird. Among its many statements are that moving clocks run slow and that moving rulers shrink. But how are we supposed to make sense of this?

I wanted to build a new piece of my Great Ball Contraption that used electrostatics to move objects. This works by charging the ball with a positive or negative charge so it attracts the next ...