Reverend Bob Larson claims to have exorcised more than 15,000 demons around the world in his career. Watch Anderson Cooper talk to his daughters, who have taken up their father’s trade.

17-year-old Tess first performed an exorcism a friend who was possessed. She says that one of the tell-tale signs is eyes that dilate: ‘You can see evil.’ Brynne’s first exorcism was at age 13: ‘I got up on stage in front of 3,000 people and cast a demon out in Africa.’ This and all the other tips teens need to know about demonology:

Move over Abraham Lincoln: Vampire Hunter, looks like the Old World had their fair share of these abominations. Christine Dell’Amore reports on National Geographic: Among the many medieval plague victims recently unearthed…