Whose book provided valuable insight into ancient egypt prior to the 19th century?

Napoleon. osiris was an ancient Egyptian god a real person. Herodotus was a greek historian. hatshepsut was an ancient Egyptian queen. I don't believe any of her writings survived. Napoleon conquered Egypt from the Mamluks. When he did so, he brought a whole ton of scholars with him and they conducted a study on basically every aspect of Egypt. Plants, animals, history, had artists draw pictures of ancient monuments, you name it. they published their findings in an enormous set of books which is really got Europeans interested in ancient Egypt for the first time.

81 is a composite number

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.