That's right, kids. Pasteur Was Wrong.
Funny thing, science. For ages, there was no certain way of determining that maggots grew from eggs laid by flies, so it was generally assumed they arose naturally from putrefying meat and other sources. It was a different time then— heavier rocks fell faster; bloodletting cured illness, etc.
Funny aside: Spontaneous Generation is an ancient example of [...] [tvtropes.org]