Forget hunting for a tape measure or a protractor. Use your Android phone camera and sensors to handle different types of measurements easily.

Imagine a satellite, floating in space. How would you measure its voltage? Yes, it probably has a non-zero voltage, a consequence of geospatial electric fields and ion and electron currents. The ...

THE measurement of the optical thickness of biological objects, such as cells, in the living state can yield a value for the dry weight of the object 1,2. Such measurements, however, are difficult to ...