As we overheat and degrade our planet, more people are set to come into contact, sometimes fatally, with venomous snakes. One man hopes to provide an unusual solution to this, after subjecting himself to 200 intentional snakebites to his body.

For nearly 20 years, Tim Friede, 58, allowed some of the most lethal snakes in the world to bite him so he could build up an immunity that could one day be developed into a universal antivenom.

This extraordinary and painful quest, undertaken by a window cleaner with no formal scientific training in the basement of his Wisconsin home, nearly killed Friede, almost cost him his leg and his fingers and at one point put him into a coma.

Friede’s sacrifices are now poised to help deliver a new, broad antivenom that may avert some of the 138,000 deaths and 400,000 disfigurements and disabilities currently caused each year by snakebites worldwide, most of them poorer people in developing countries across Asia and Africa. In total, as many as 5.5 million people globally are bitten by snakes a year.