There are Valentine cards, ecards, and gifts for every taste imaginable! If you don’t find a card or image that perfectly expresses your sentiments, you can easily make your own. And if you lack the imagination, skills, or time to create one, someone else probably has just what you’re looking for. The scientific community is no exception -and they take advantage of every opportunity to make a pun when they can. Here are some very clever valentines from different scientific disciplines.