Modern earphones were designed by Nathaniel Baldwin, who submitted his ideas to the Navy for testing in 1910. However, there were many designs of in-ear pieces that predated Baldwin's and contributed to his ideas.Know More
Stethoscopes were one of the earliest in-ear devices. In the 1850s, they were invented for listening to a patient's heart and lungs, and Thomas Edison used them with his phonograph machine. In the 1890s, British opera houses and theaters started supplying the audience with rudimentary headphones. In 1891, Ernest Mercadier invented the bi-telephone, a pair of earbuds that blocked out noise.
With the Navy's guidance, Baldwin's final design consisted of two sound receivers, each containing a mile of copper wiring, attached to the operator's headband. This design was the foundation for electricity-free telephones used in World War II.
John Koss then developed the first commercialized stereo headphones in 1958. In 1979, Sony invented the Walkman.Learn More
Yogurt has been part of the human diet since around 6000 to 5000 B.C and was first made in Central Asia. Yogurt sold in its frozen form was invented in the early 1970s by a dairy operator from New England named H.P. Hood.Full Answer >
Modern ice hockey rules were created by Canadian athlete, journalist and lawyer James George Aylwin Creighton. The first game of modern ice hockey was played in 1875 in Montreal, Canada. Ice hockey likely evolved from field hockey played in Northern Europe.Full Answer >
William Morton first demonstrated the use of ether as an anesthetic, but no one knows who actually invented anesthesia. After Morton's demonstration at Massachusetts General Hospital, several people came forward claiming they had discovered anesthesia much earlier.Full Answer >
Items invented in 1998 include Windows 98, the iMac computer and the MP3 player. Viagra was also approved for use by the United States Food and Drug Administration in 1998.Full Answer >