Couples' personalities converge over time to make partners more and more similar.
235
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
The average person will go on a date at least 100 times before they finally marry.
33
The average person in their lifetime will spend an estimated 20,160 minutes kissing!
212
Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
88