Vaccinated

Wow! this guy, Maurice Hilleman is probably responsible for saving more lives than anybody else in history.
He developed or contributed to vaccines that saved 10s or 100s of million lives.
Go read a summary of his accomplishments on Wikipedia and then read this book.
You'll probably want to add his birthday to your calendar so you can remember his contributions to humanity.
I wish I'd known about him while he was still alive.