The old food pyramid vs. RFK Jr's 'New Pyramid': See how the guidelines have evolved over time

The USDA first published guidance in 1980, then a food pyramid in 1992 and a 2011 "MyPlate" version. Here's how they stack up ...
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How did ancient Egyptians stack those heavy stones of the oldest pyramid? Scientists float new theory

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. For years ...
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The first pyramid inscribed with sacred texts

The Pyramid of Unas may be small in size, but it holds a massive place in Egyptian history. As the first pyramid to include ...
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Engineers have a new theory on how Egypt's first pyramid was built

Scholars think they have an answer to a question that has puzzled generations. How did ancient Egyptians, thousands of years ago, move all those heavy stones, stack them up and make the pyramids?