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
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
88
One in five long-term love relationships began with one or both partners being involved with others.
177
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
278
Speed dating was invented by a Rabbi in 1999.
45