The Sims 4 gives you tons of freedom while building, but sometimes that grid just gets in the way. How do you move objects freely?

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?

They make distant objects move together in a way that classical gravitational waves cannot. This suggests that at very small scales, gravitational waves may show quantum features, like ...