These early candles were made of wicks stuck into containers filled with a flammable material. The first dipped candles were made by the Romans from rendered animal fat called tallow. Since tallow is ...

These stacks of tiles are part of a very clever Roman invention, the hypocaust. The hypocaust was a space under the floor where the air would be heated by a small fire. The floor was raised up by ...

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Water is heavy stuff. When the ancient Romans undertook to build an aquaduct to carry fresh water from the mountains into the city, they needed a structure strong enough to support all that water, as ...