Modems have special purpose hardware that do a form of FFT to sort out the many-noted chords the modems use to talk to each other. By sending chords for extended periods of time helps mathematically average out the static noise.
Back in 1824 Fourier discovered the greenhouse effect (when Marx was still only 6 years old). Svante Arrhenius, the great Swedish chemist published his calculations in 1896 about how atmospheric CO₂ concentrations control the average global temperature and how certain amount of CO₂ was needed to prevent an ice age.
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