Beams of light that can be guided into corkscrew-like shapes called optical vortices are used today in a range of ...

Q. I was cleaning out my shed and found a big pile of empty snail shells in the corner. No snails or shells anywhere else — just in that corner. What gives? Probably rats. They like to eat ...

Q. I was cleaning out my shed and found a big pile of empty snail shells in the corner. No snails or shells anywhere else — just in that corner. What gives? Probably rats. They like to eat snails and ...