When Yukinori Kawae explores the Great Pyramids at Giza, he isn’t after treasure or lost chambers—he’s looking for dimensions. For all that the pyramids have been dug, scanned, and ...

What do you see in the population pyramid? Each year starts with the number of children who are born. This group moves up to a higher age every year. As age increases, groups get smaller because ...

Cairo's most popular attraction, the Pyramids of Giza, draw thousands of visitors every year. As one of the original Seven Wonders of the World, these pyramids have stood the test of time ...

What do you see in the population pyramid? Each year starts with the number of children who are born. This group moves up to a higher age every year. As age increases, groups get smaller because ...