In 1873, after a session of ice skating, 15-year-old Chester Greenwood invented earmuffs. His company, Champion Ear Protectors, provided steady work for the citizens of Farmington, Maine for over sixty years. The state celebrates December 21, the traditional first day of winter, as Chester Greenwood Day.
Greenwood's initial idea envisioned warm cotton balls held in a shaped wire. With the help of his grandmother, he used beaver fur and cloth to craft the first earmuffs. Later becoming a machinist and the owner of a bicycle shop, Greenwood also patented a wooden-spool-making machine, a steel-toothed rake, shock absorbers and a flat-bottomed tea kettle.Learn More
Italian astronomer Galileo Galilei was the inventor of the first pendulum clock, after his discovery of isochronism, which is the time that the pendulum takes to swing. Contrary to popular belief, Galileo was not the inventor of the telescope; Galileo built a telescope based on creations by the Dutch, and it was known as a spyglass. Galileo also built a thermometer and a compass during his lifetime.Full Answer >
The Ancient Egyptians are the well-known constructors of the Pyramids and the Great Sphinx. They invented hieroglyphs, one of the earliest writing systems, and a number system for whole numbers and fractions, including rudimentary algebraic formulations. Egyptians created breath mints, toothpaste, the calendar and bowling. Perhaps their greatest invention, however, was papyrus scrolls, which allowed information to be collected, transported and stored for immediate use or for future generations.Full Answer >
Niels Bohr's greatest discovery was the atomic model. Bohr's model shows the atom as a positively charged nucleus surrounded by orbiting electrons. Bohr also discovered that electrons travel around the nucleus in distinct, concentric orbits.Full Answer >
John MacAdam invented a new type of road, known as the Macadam, which revolutionized road construction in the early 19th century. Macadam roads used large, broken stones in symmetrical patterns, covered with small stones, to create a hard surface.Full Answer >