Back in the 17th century, right around the time when the ideas of great thinkers like Descartes and Newton and Hobbes began to shape the world, a Jesuit priest named Athanasius Kircher also tried to make his mark.
Kircher was something of a jack-of-all-trades. He wrote more than 30 books; he was a philosopher, an inventor, a historian, a scientist. Back in his day, everyone knew about him. But it didn't help his reputation that many of his theories and inventions just couldn't hold water.
Americans own an estimated 300 million guns. It's a level of gun ownership that no other country in the world comes close to matching. It's also a source of controversy in the U.S., where groups on both sides of the issue seem to have dug deep into the debate.