THIS DAY IN SCIENCE: First Barbed Wire Patent in 1874

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Human Circuit – Conductors and Insulators – by Steve Spangler

The Energy Stick makes quite the “buzz” when you’re using it. To the untrained eye, it appears to be a plastic tube with a jumble of wires inside and two silver bands at each end. Well, those silver bands are actually electrodes. All the wires on the inside? They’re a solid state sensing circuit, tone generator, sound transducer, battery power supply, and LED lights. The perfect use for the Energy Stick is as a simple, yet fun, tool for learning about continuity and circuits. So… how do you turn it on?

Link to Steve Spangler for more details 

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