Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Couples' personalities converge over time to make partners more and more similar.
235
Wearing red increases attraction.
30
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
The typical person spends about 600 hours having sex between the ages of 20 and 70.
234
Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
88
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39