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Our daily lives are filled with moments shaped by the principles of science. From high-speed subways and airplanes soaring through the sky to phone calls that connect us across the seas. Capturing the scientific principles that enrich our everyday experiences, Korea Post is issuing commemorative stamps titled the “Principles of Science in Everyday Life.” The stamps feature Faraday’s Law, which opened the age of electricity through the motion of magnets, and the Doppler Effect, which reveals the world of motion. Michael Faraday, FRS, despite having little formal education, was a British scientist who rewrote the history of electromagnetism through his endless curiosity and spirit of experimentation. He discovered experimentally that when the magnetic field passing through a coil changes, an electric current flows through it, a phenomenon known as Faraday’s Law of Electromagnetic Induction. This monumental discovery completely transformed human civilization. The principle behind power plant turbines that generate electricity by rotating massive magnets, the operation of motors and transformers, wireless charging in smartphones, and contactless transit card payments all stem from Faraday’s Law. Christian Andreas Doppler, an Austrian physicist, theoretically identified that the frequency of a wave changes depending on the relative velocity between the source of the wave and the observer. A phenomenon known as the Doppler Effect. This principle explains why the siren of an approaching ambulance sounds higher in pitch and lower when it moves away. Astronomers used this principle to interpret the motion of distant stars and prove the expansion of the universe. Meteorological radars apply it to predict the movement of rain clouds, and medical ultrasound devices use it to detect the invisible flow of life within blood vessels. From police speed cameras to baseball pitch speed measurements, the Doppler Effect is utilized across various fields of modern technology. Science is neither difficult nor distant. When we come to understand the scientific principles hidden within everyday conveniences, science offers us the joy of new discoveries.