The Roman Dodecahedrons: Over 100 of these small, hollow, 12-sided bronze objects have been found across Europe, dating from the 2nd to 4th centuries AD. Each face has a circular hole of varying size, and the corners are adorned with small knobs. Archaeologists are completely baffled by them. Theories range from sophisticated surveying instruments and candle holders to simple knitting tools or even children's toys. Have you heard of these?

Woolly Mammoths and the Pyramids: While we often associate Mammoths with the "Ice Age," a small population survived on Wrangel Island in the Arctic until approximately 1650 BCE. By the time the last Woolly Mammoth died out, the Great Pyramid of Giza was already nearly 1,000 years old. Does this fact surprise you?

The Cinnamon Shower: In Denmark, if you reach your 25th birthday and are still single, it is a tradition for friends and family to ambush you and cover you from head to toe in cinnamon. If you are still single by age 30, the cinnamon is upgraded to black pepper. If this happened to you, would you find it funny or annoying?

The Antikythera Mechanism: Recovered from a Greek shipwreck, this 2,000-year-old device is often called the world's first analog computer. It features a complex system of over 30 bronze gears used to track the cycles of the solar system, eclipses, and even the timing of the ancient Olympic Games. The level of engineering found in the device wouldn't be seen again in history for another 1,000 years. Do you own a computer?