Blood-Powered Devices

Blood-Powered Devices

Nearly all our electricity comes from mechanical energy; a flow of liquid or gas passes a propeller or similar device, which spins magnets in a coil of wire to produce an electrical current. This is the basic technology behind hydroelectric, coal, gas, nuclear, and...
New Way to Harvest Heat Energy

New Way to Harvest Heat Energy

The three Laws of Thermodynamics are sometimes simplified as “You Can’t Win, You Can’t Break Even, and Can’t Quit the Game.” The second Law says that energy inevitably leaks out of a system. One obvious example is a car engine; it converts fuel to...
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