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It took approximately 2.5 million blocks to build the Pyramid of Giza, which is one of the Great Pyramids. See more
The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function, she must be able to see another pigeon. See more
Every Swiss citizen is required by law to have a bomb shelter or access to a bomb shelter. See more
In fact, Einstein couldn't speak fluently when he was nine. His parents thought he might be retarded. See more