That would be Edward Jenner. He saved more lives than anyone else in history, and that number increases by the day. If it were up to me, his birthday would be an international holiday and kids would learn his name in elementary school.
This is a great concept. I hope it catches on.
I participate in a pledge called #50forFOSS. On the first Friday of every month, I choose an open source project and give the maintainer $50, no strings attached. It lets me target small projects that may not have a lot of users, but are valuable to me, as well as bigger ones with more expenses. My mindset these days is that I need to insist on paying for the software I use, because if I don’t, someone else will (i.e. advertisers and venture capitalists, which is bad) or no one else will (i.e. abandonware, which is worse).
Disclaimer: I started #50forFOSS and there’s a very small group of us who are doing it.
Mosquito baiting