In a previous post, I discuss how Curiosity Kills the Rat.
The short story is that toxoplasmosis, a protozoan parasite carried by cats and some other critters (but almost never by dogs), changes rat behavior and makes them more susceptible to predation by domestic cats, which are the parasite's definitive host.
Now it turns out that toxoplasmosis is not the ony parasite that shapes animal behavior, and it also turns out that motorcycles and fast cars are involved.
Yes motorcycles and fast cars.
Watch the video.
This is Stanford primatologist and neurobiologicst Dr. Robert Sopalsky explaining how research about "toxo" has given us (maybe) a new window into human behavior.