In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
Couples' personalities converge over time to make partners more and more similar.
235
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456
Wearing red increases attraction.
30
Historically, sweat has been an active ingredient in perfume and love potions.
309
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44
40% of people who are rejected in romantic love slip into clinical depression.
72
In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
28