We learned about a funky (now defunct) theory in Developmental Biology this week, called the Preformation Theory. Basically, in the 1800's people thought that we were preformed, meaning that we were fully formed in our fathers' sperm. This "mini-me" was called the "homunculus".
Scientists believe that the homunculus in the sperm just needed to be implanted in an egg, which acted like soil for the growth of the human. It's interesting to learn about some of the old theories, that people thought were true for many years. It makes you wonder about some of the things we believe now...
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