Learn how to make a simple lemon battery and use it as an emergency phone charger in this hands-on science experiment. Watch ...

The accuracy of the circuit can be drastically increased by making a couple of minor changes. Figure 2 shows the basic circuit. An astute reader will immediately see the two circuits’ similarities 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 ...