53 reactions | This is a carbide lamp—a 100-year-old invention that worked without electricity or fuel. It was commonly used in mining tunnels and even on bicycle headlights. How did it work? Just add calcium carbide and a few drops of water, and it produces acetylene gas, which burns with a bright flame! No wires. No batteries. Just pure chemistry!  #science #reelsviralシfb #history | Manish Kumar Gupta | Facebook