How syphilis took Europe by storm during the 1490s, and the far reaching effects it's had ever since
The Martin Luther Insult Generator. That is all.
Today is Reformation Day, the anniversary of Martin Luther nailing the 95 Theses to the door of the Wittenberg Castle Church in 1517. He was largely criticizing the practice of selling indulgences (forgiveness for sins). He didn't intend to split with the church. He left room for the Pope to slip out of the indulgences corruption. But the Pope didn't, and the split eventually came.