John Rock was baptised Catholic, and was a pioneer behind stem cell research and birth control. This is the story of his struggle with his faith, science, the church, and what we didn’t know then. Written by Malcolm Gladwell.

“Rock, his friends would say, was in love with his church. He was also one of the inventors of the birth-control pill, and it was his conviction that his faith and his vocation were perfectly compatible. To anyone who disagreed he would simply repeat the words spoken to him as a child by his home-town priest: ‘John, always stick to your conscience. Never let anyone else keep it for you. And I mean anyone else.’”