Does it take fewer muscles to smile than to frown? Well, it depends on who you ask. There are 53 facial muscles, and deciding which are involved in frowning or smiling is a bit subjective. By some counts, it takes a mere 11 to smile and an enormous 12 to frown.

Don't feel like smiling? Studies show that even faking a smile can make you feel better... and it only takes an energy-saving two muscles!