Valentine's Day links

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

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

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

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.

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.

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

ICYMI, Wednesday’s links are here, and include pancake physics, lots of ape-men other than Sasquatch, a gallery of photos from inside the wreck of the Costa Concordia, and hair dyed to look like art masterpieces.