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The earliest evidence of ancient dentistry we have is an amazingly detailed dental work on a mummy from ancient Egypt that archaeologists have dated to 2000 BCE

"Advanced dentistry techniques allowed Native Americans to inset gemstones to their teeth as far back as 2,500 years ago. The early dentists used a drill-like device with a hard stone such as obsidian, which is capable of puncturing bone. The ornamental stones—including jade—were attached with an adhesive made out of natural resins, such as plant sap, which was mixed with other chemicals and crushed bones."

Clepsydra or water clock, faience. Egypt, 4th century BCE. One of the earliest known time-keeping devices, water clocks had inner markings which revealed time passed as water ran out of them.