French military engineer and physicist regarded as the father of thermodynamics. His first successful theory of maximum efficiency of heat engines laid the foundations of the field and led to the development of the second law of thermodynamics by Rudolf Clausius and Lord Kelvin.
The world's first handheld commercially available mobile phone was Motorola's DynaTAC. It was priced at $3,995 upon release and had an LED display for dialling and recalling numbers. Martin Cooper of Motorola made the very first call from a cell phone using the DynaTAC on 3rd April 1973. [more...]