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...simple electronic circuits see how signals can be represented in the time and frequency domains for Fourier analysis record, analyse and filter audio signals to improve their fidelity...An introduction to electronics: 1 Electronics everywhere - Electronics is the art of controlling the movement of electrons in order to design components and circuits that are put together...

...simple thought experiments to make predictions about the behaviour of the universe. My favourite was his insight into evaporating black holes, which combined general relativity and quantum mechanics. His ability to remain engaged with the scientific community despite his physical condition was a testament to his rare talent. Hawking also recognised the enormous potential...