Bulletproofheeb of Buzznet has written a fascinating article—well, fascinating if you’re a Star Wars fan—about Princess Leia of the original Star Wars trilogy. The main crux of the story?

There is a medical term “hetero-paternal superfecundation” or bi-paternal twinning. This refers to an event when a mother carries two children at the same time from two different fathers. Most often this is when the mother releases two eggs (dizygotic) and has intercourse multiple times, leading to each egg being fertilized by different fathers. It is also possibly that an egg can be released during an already existing pregnancy and that egg can be fertilized by a second person, though this is much rarer. This is all true and it really does happen. Theory: Luke and Leia are a result of bi-paternal twinning.

Want more? Read on at Buzznet!