# The Fourier Series & Harmonics

The Fourier Series can create every possible waveform by combining an orthogonal set of harmonic wave frequencies at varying amplitudes. He discovered this while traveling in the desert, writing in his diary about the propagation of heat through solid rock. He was keenly interested in heat propagation because he suffered a health condition that he believed the desert heat could help heal. Now known as the Fourier Series, his solution is used in the study of acoustics, electronics, quantum mechanics and many other applications.