This flashlight doesn't use electricity or oil. Instead, it's powered by a 120-year-old technology known as a carbide lamp. To operate it, disassemble the top and bottom parts of the lamp and put these stones into the empty container at the base. It's important to note that these small stones are actually calcium carbide. When you add water, the calcium carbide reacts with it to produce acetylene gas, which is highly flammable.

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