Do you know what a hookworm is? It’s a filthy parasite which hides in your intestine, secured by a its hooks, and feeds on your blood. Ugh. They affect around 600 million people in the world, and can’t be detected with the human eye. Why the hell am I telling your about this in the Cult of Mac? Because an enterprising Canadian doctor has hacked his iPhone to diagnose the presence of these filthy animals.