Using cosmic particles called muons, and possibly tiny robots, scientists hope to figure out what created two mysterious voids inside the Great Pyramid.
Possibilities range from a new burial chamber to a sealed-off construction passage.
Built by the pharaoh Khufu (whose reign started around 2551 B.C.), the Great Pyramid of Giza stands 455 feet (138 meters) tall and was the tallest human-made structure in the world until the Lincoln Cathedral was completed in England in the 14th century.
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