While we know it was built for Pharaoh Khufu, the precise methods used by the ancient Egyptians to construct the Great Pyramid of Giza, especially how they lifted the massive stones, are still debated. What is the most widely accepted theory for moving the stones to higher levels?
In 1908, a massive explosion flattened over 2,000 square kilometers of forest in Siberia, Russia, with no impact crater found. What is this mysterious event known as?