“Spin this arrow 180 degrees and it still points to the right,” the description reads. “[O]nly in a mirror will it point left (and only to the left).” The obvious answer for how this works ...

A Cosmic Oddity That Defies Expectations The Andromeda galaxy, our closest spiral neighbor at about 2.5 million light-years away, has long fascinated astronomers.Surrounding it are dozens of ...