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...
High Tech Comb Kills Head Lice

High Tech Comb Kills Head Lice

Between 6 and 12 million children suffer from head lice infestations every year in the U.S. alone. They spread through direct contact (lice and their eggs die within a day or two if they fall on the ground), so it’s common for them to affect children in...