Valentine's Day links

Horror movie-themed Valentine's Day cards and a collection of really nerdy Valentine’s Day cards.

Video: The Science of Chocolate (aka the real meaning of Valentine's Day).

The history of those chalky little pastel hearts with sayings on them. 

7 Aphrodisiac Cocktails to Put You in the Mood.

A dose of cynicism for Valentine's Day.

Forget chocolate on Valentine’s Day, try semen, says Surgery News editor. Retraction, resignation follow.

Everything you ever wanted to know (and more) about My Funny Valentine.

Anti-Valentine's Day cards from a bygone era, plus Vintage Valentines from 100 Years Ago and a collection of vintage meat and weapons-related cards.

An animated history of Valentine's Day, plus why the heart is associated with love.

Prepare to be offended (or don't click on this link) - the Holy Crap worst Valentine's Day card ever, plus runners-up.

ICYMI, Friday's links are here, and include the 'untranslatable' emotions you never knew you had, a supercut of people running in slow motion in movies, the human race's 9,000 year old love affair with booze, and a DIY machine that sorts M&Ms and Skittles by color.