Learn how to make a simple electric doorbell at home in this step-by-step tutorial. Using everyday materials like cardboard, a DC motor, battery, metal bowls, a clothespeg switch, and basic wiring, ...

Learn how to make a simple lemon battery and use it as an emergency phone charger in this hands-on science experiment. Watch step-by-step as we cut lemons, prepare copper and aluminum electrodes, and ...

The creative new approach could lead to more energy-efficient machine-learning hardware. On a table in his lab at the University of Pennsylvania, physicist Sam Dillavou has connected an array of ...