Oh my, teachers in a rural Ugandan school were unknowingly using a live bomb as a bell. They would bang the bomb with stones to call the school's 700 students to class. It was a miracle nobody caused it to detonate.
One of the most puzzling mysteries is how Stonehenge, the prehistoric circle of stones in England, came to be. We know it was built around 4,500 years ago, and the stones came from Wales, some 250km away...but how?