Toxoplasmosis — you may have heard about it, but how much do you really know about it? Toxoplasma gondii is a single-celled parasite known for being found in cat droppings, with a reputation of getting into human beings and making them slightly... off. It's true, and more complicated, than you may expect. This particular parasite has also found its way into way more people than you may expect — maybe even you.