It's dreary outside, and you remark on the beautiful weather. An incompetent co-worker is promoted, and you say she'll do a great job. It's not Opposite Day -- it's sarcasm.
From athletes growing beards during the playoffs to pedestrians not stepping on the cracks of sidewalks, some scientists believe our superstitions are the product of evolution. How are we hardwired to believe in luck in situations beyond our control?