The man who developed heart surgery was on the payroll as a janitor
This is not one of those "[very loosely] based on a true story" movies like "Braveheart". This really freaking happened.
Anybody who has ever benefitted from heart surgery -- their own or a loved one's -- owes a debt of gratitude to an obscure Black Southern carpenter with the unlikely name Vivien, on the payroll of Johns Hopkins as a janitor. This is a staggering story.