In this episode of Mind Blow on Vsauce2: scientists have a new hypothesis for why bugs fly around light bulbs, we learn of secret science new virus hiding in baby diapers, in space news Einstein helped discover a massive black hole, a simple drought solution, fruit helping recycle batteries, an ancient Egyptian gifting custom now has physical evidence, a massive leap in MRI brain scan technology, and bioadhesives just got stronger and safer for surgery.