The Surprising Frequency of Interspecies Mating
Sometimes different but related species can reproduce. When two different species successfully mate, the resulting offspring is called a hybrid.
When Forced Sterilization was Legal in the U.S.
The 1927 case of Buck v. Bell set the stage for forced sterilizations for eugenics, but it turned out to based on complete falsehoods.
Everything You Ever Wanted to Know About Frog Sex (but Were Afraid to Ask)
New research suggests that specific positions may serve to ensure that frog species only mate with their own kind.