Nice set of books, right? Ah, but it’s a trompe illusion, art that tricks the eye into thinking it’s looking at a three-dimensional object. What you’re actually seeing is a book façade hiding a secret ...

A black WiFi modem sits on the floor next to the wall in a brightly-lit room. - Lucas Ninno/Getty Images While you might not want to admit it, your Wi-Fi modem is probably the most important thing in ...