(WHTM) — There’s nothing like a bewildering optical illusion to get the weekend off to a good start. There are all kinds to choose from: the image that looks like one thing but also looks like another ...

The targets are the images displayed on an LCD screen (left two columns) and the objects in the wild (right two columns; beckoning cat doll and stuffed bear), respectively. The first row shows the ...

Physicists have demonstrated one of the quintessential effects of quantum optics -- known as the Hong-Ou-Mandel effect -- with microwaves, whose frequency is 100,000 times lower than that of visible ...