Here's a message which will appear if the video isn't supported. A Flash alternative can be used here if you fancy it.
Feb 7, 2016 1:09 AM
How has toxoplasma turned the world into zombies?
Toxoplasmosis is a parasitic infection that favors cats, but it can also be found in humans. Discover the disturbing details of how toxoplasma gondii finds a host -- and how it affects human beings -- in this podcast from HowStuffWorks.com.