Between 2667-2648 BC, the oldest pyramid was built for King Zoser. It is the oldest stone structure that we know of.
In the modern world, people don't build pyramids like this anymore, instead, they make houses or buildings. People use pyramids like this for tourists to take pictures at or use it to attract people from around the world.
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| Not What It Looked Like |
Toothpaste
The Egyptians had a lot of trouble when it came to their teeth because their bread had grit and sand in it, which wore out their enamel (thin outer layer covering the tooth) and so they used the powder of ox hooves, ashes, burnt eggshells and pumice (a volcanic rock that has a rough texture of volcanic glass and it may or may not have crystals in it) to make toothpaste to clean their teeth with.
Nowadays our toothpaste is made out of hydrated silica (a form of silicon dioxide, which has a variable amount of water in the formula), hydrated alumina (a crystalline, water-soluble powder), calcium carbonate and dicalcium phosphates. But just like the Egyptians, it is also used to clean our teeth and get rid of the pieces of food that might've been stuck in our teeth. Toothpaste nowadays isn't just for the rich, it is for everyone to use.
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