Historically, sweat has been an active ingredient in perfume and love potions.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
26
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
10
Couples' personalities converge over time to make partners more and more similar.
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