Archaeologist found a 4,500-year-old pyramid contraption that might have answered the age-old question of how the Great Pyramid at Giza was constructed. Researchers managed to find a ramp system that was used to pull alabaster stones up a steep slope. Yannis Gourdon, co-director of the joint mission at Hatnub explained how this mechanism could have helped Egyptians to build pyramids: “Using a sled, which carried a stone block and was attached with ropes to these wooden posts, ancient Egyptians were able to pull up the alabaster blocks out of the quarry on very steep slopes of 20 percent or more.”