Mystery: All across the world, people were finding strange, pointed objects buried in fields. One of the main theories was that these 'thunderstones' were thrown down to earth by gods during a mighty thunderstorm battle. Explanation: In the 1580s, a Vatican City official named Michele Mercati realised that these 'thunderstones' weren't anything godly or otherworldly. He theorised that they were actually arrowheads from the Stone Age, though no one at the time particularly believed him. Around 100 years later, the theory was confirmed, although the belief of the 'thunderstones' persisted well into last century in certain areas.
