From Manure Mountains to Train Terrors: 4 Bizarre Fears Humans Left Behind

Human beings are a panicky species – quick to fear and slow to understand. Over much of our evolutionary history, this ingrained alarm served us well, keeping us alive in a wild world brimming with dangers. But as humans came to dominate the globe and render the Earth more and more harmless (at least to us, mostly), we started to fret about increasingly innocuous things.