That awkward moment when your really tired and forget to charge your phone and have to go to school with 25 percent of your battery charge. — Zavier Grant Copy Share Image
“Eventually (about eight percent of battery left), my computer makes a sound and a message pops up to alert me that the battery is very low. This is an example of signaling when an event is infrequent, but important. (I… — Susan M. Weinschenk Copy Share Image
