• accelerometer
1794

• electromagnetic spectrum
6912

• electromagnetic spectrum
As darkness is one of very few things that we instinctually fear, we have always bestowed light with godlike properties. But for all of antiquity we have no idea what light really was.
7033

• mobile phone
3239

• modulation
frequency, amplitude, quadrature
6921

• SIM Card
Subscriber Identification Module
6865