Heinrich Rudolph Hertz, a German physicist, discovered the existence of electromagnetic waves in 1887. This was a result of his expansion of James Clerk Maxwell's mathematical "Electromagnetic Theory of Light," published... More »

Electromagnetic waves can travel and transport energy without a medium through which it may travel. This contrasts with mechanical waves, such as sound waves, which cannot travel through a vacuum. If electromagnetic radi... More »

The fundamental source of electromagnetic radiation is the vibrational interaction between an electric field and a magnetic field. This phenomena is driven by the motion of electrically induced particles propagating thro... More »

Two people are credited with the invention of the French horn: Heinrich Stoelzel and Friedrich Bluhmel. The French horn was invented in the 19th century based on designs that dated back to the 16th century. More »

Heinrich Goebel, a German inventor and mechanic, patented three inventions, including a sewing machine hemmer improvement, a Geissler system of vacuum pumps improvement and an electric incandescent lamp. The lamp patent ... More »

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Albert Einstein was a German-born physicist who became well known after earning his Ph.D. and publishing scientific articles. His theories on relativity and photoelectric effect are his most famous discoveries. More »

The German physicist Julius Mayer first stated the law of conservation of energy in 1842. He discovered that a chemical reaction created heat and work, which then made more heat. The law of conservation of energy states ... More »