You burn 26 calories in a one minute kiss.
605
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Historically, sweat has been an active ingredient in perfume and love potions.
309
Men fall in love faster than women do.
32
One in five long-term love relationships began with one or both partners being involved with others.
177
Two in five people in the world marry their first love.
270