A major challenge in self-powered wearable sensors for health care monitoring is distinguishing different signals when they occur at the same time. Researchers addressed this issue by uncovering a new ...

An accelerometer measures the acceleration of your phone. It does that on three axes: horizontal, vertical, and forward/backward. It also senses vibration, tilt, and free fall. Being able to calculate ...

Laser diodes are semiconductors that generate light and amplify it using repeated reflection or "optical feedback." Once the ...