A black hole is a place in space where gravity pulls so strongly that even light can not get out. And because no light can get out, we can't see black holes -- To us, they are invisible. Space telescopes with special tools can help find black holes by observing how stars that are very close to the black holes move. So, are black holes the ruthless killers we've made them out to be? Samir Mathur, a professor of physics at The Ohio State University says no. He takes issue with recently proposed ideas that black holes have "firewalls" that destroy everything they touch. Mathur used principles of string theory to show that black holes are actually tangled-up balls of cosmic strings and his "Fuzzball Theory" has helped resolve certain contradictions in how physicists think of black holes.