Richard Hoe was born in New York in 1812. He invented the rotary-press in 1843, 10 years after his dad died. He became president of his father's press manufacturing company when he was 21. The Rotary Press uses rotating drums. It can print 7 million pages per hour. Magazines began growing in popularity during the 1820s.
Al-Razi was born in Iran in 865 A.D. Later on in his life, he discovered kerosene. Kerosene is used for heating and lighting. Knowledge was lost over time. Abraham Genser was born in Canada in 1897. When he was 27, he got married. He moved to England to become a doctor. After meeting Charles Lyell, he became interested in geology. He practiced geology and medicine back home in Canada. He invented Kerosene in 1846. Gesner formed a company in 1850 to sell lamps and oil. He became the richest man in America. He turned completely to giving away his money instead of keeping it. Kerosene put man on the moon.
Ignaz Semmelweis was born in Budapest in 1818. He worked for Vienna General Hospital. He invented a use for antiseptic in 1847. Semmelweis reduced mortality from 18% to 2% in one month. Repeated success in Budapest in 1857. Germ theory gained dominance in the 1880s.
People wear gas masks to filter polluted air. Ancient cultures used gas masks. Lewis P. Haslett invented the prototype of modern version in 1847. Gas masks protect lungs from polluted air. Germans launched chemical weapons in World War I. Modern gas masks were invented in 1844. The army uses gas masks on the battlefield.
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