A scientist lets hookworms burrow into him to test a hypothesis

Dedicated, or crazy:

When Professor David Pritchard wanted to test the effects of parasites on humans, he had to apply to the Ethics Committee.

They refused him the go-ahead because they weren’t confident it was safe. So there was only one thing for it: he volunteered himself.

This involved putting 50 hookworms on a plaster, then sticking it to his arm so they could burrow under his skin and travel to his gut. They would live in his body for five weeks.