Sqrt(16) is just 4, but x^2=16 gives x=+-4

Original Video Credit: IG/namayeshgah_cheragh Long before LEDs and battery powered lights, pressurized lanterns like the Petromax could produce an astonishing amount of illumination using only kerosene and clever engineering. The process begins with the rapid heater, which creates a powerful blue flame beneath the generator tube. This preheats the metal components so liquid kerosene can be converted into a vapor before entering the burner. Once the generator is hot enough, the main valve is open

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