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Who invented the lever?

Having discovered the reasoning behind why levers worked, Archimedes once famously stated, "Give me a place to stand on, and I will move the Earth." Using the principle of leverage, he invented block and tackle pulley systems, which allowed sailors to lift heavy objects that were too heavy to be lifted in any other manner.\nLevers are employed in some of the most basic instruments used in modern times, including nutcrackers, tongs, scissors, pliers and hammer claws.

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When were jeans invented?

Jacob Davis was a tailor who came up with the idea of strategically placing rivets along key stress points in work pants to make them more resistant to wear. He partnered with Strauss to develop a new kind of work clothing to sell to California gold miners. Strauss was a local merchant, and together they worked on the clothing, trying various materials before settling on denim. Denim has a long history of use as work clothing and is particularly associated with the Italian city of Genoa, where it was worn by sailors. The word "jeans" is an English derivation of this city's name.

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What were Marco Polo's inventions?

The geography of Asia made it very difficult to access at the time of Marco Polo's explorations, and he was exposed to a world that few other Europeans had seen. Some of Europe's first maps of Asia were based on the information in Polo's book, today referred to by its English title, "The Travels of Marco Polo." Polo's book is credited with introducing the idea of paper money to Europe, including how it was made and used. Also of note are his descriptions of where and how salt was produced, which was of particular importance as it was also used as currency.\nAfter many years..

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What are fifth-generation computers?

During World War II, Sperry Band and IBM created what is now considered the first generation of computers. From there, the computer evolved to include different languages, including Fortran, or formula processing, and LISP, or list processing. European developers created another generation, PROLOG, which was abbreviated for logic programming.To help join the technology race, the Japanese government started the fifth generation project in the 1980s. The goal was to use technology like PROLOG to eliminate a number of issues and make computer technology easier to operate.

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How much money did a female make as a teacher in the 1700s?

Today's education system, with full-time teachers (male or female), began in the early 1800s. The teaching profession became more standardized, requiring teachers to have a higher level of education. This prompted a new salary system that paid teachers in money. This system of pay was based on teaching level, with elementary educators being paid less than those teaching secondary-level students. This was still an unfair system, with female and minority teachers paid less than non-minority males. According to Cowley County Teacher, monthly pay for a female teacher in 1877 and 1878 was arou..

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How long was the 1927 earthquake in China?

The earthquake caused a multitude of ground fissures up to 14 kilometers long, 13 meters wide and 7 meters deep. The tremors were felt up to 700 kilometers away from the epicenter.\nThe U.S. Geological Survey reports that the area of greatest intensity suffered extreme damage. The town of Gulang was almost completely destroyed, and more than 40,900 people were killed. Landslides caused by the earthquake buried several villages in the Dongchuan area and created a new lake in Wuwei county. More than 250,000 livestock were killed in the earthquake.

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When were cast iron radiators invented?

In 1872, Nelson Bundy created the Bundy Loop, a series of elongated cast iron loops attached to a cast iron base that resembles the classic style familiar to most people today.\nThe history of steam heating dates back to ancient times, when Romans ran hot water through pipes beneath floors to heat buildings. Jean Simon Bonnemain developed the first enclosed hot water system in Paris in 1777 for incubating chicken eggs. The Marquis de Chabbanes developed a system for heating large areas in 1817 as a method for keeping the grape vines of his wealthy clients warm.\nAngier Perkins developed a boil..

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Who invented the drinking straw?

While Marvin Stone's straw was the first patented drinking straw, people did use straws before Stone's invention, in the form of hollow rye plant stems. The rye stems fell apart, affecting both the texture and flavor of drinks. Stone's drinking straw was made from paper tubes coated in paraffin. The first patented drinking straw was 8.5-inches long. Stone also invented a machine for rolling paper straws, which was also used for making radio components. Joseph Friedman enhanced straw construction with a 1936 patent application that involved adding scores that make it easy t..

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What was happening in 1944?

In April of 1944, two prisoners escaped from Auschwitz concentration camp. Their story confirmed rumours about the Holocaust and Nazi death camps, and details of such were reported by the BBC and The New York Times in July. As Soviet forces moved across Poland, several concentration camps were either dismantled by the Nazis or liberated by invading forces. Access to rail transportation was limited, and the weak and malnourished prisoners of Nazi-dismantled camps were forced to walk during relocation. Those who fell behind during these death marches were shot.\nTwo major natural disasters disru..

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Who was the British Prime Minister during World War II?

At the end of Churchill's tenure as prime minister, Germany had surrendered, in May 1945, but Japan had not. Japan did not surrender until September 1945, and the United States took the majority of the responsibility for ensuring Japanese surrender. Churchill served as prime minister during the signing of the major treaties and the convening of major international conferences, although he was technically not prime minister at the very end of the war. With Europe relatively stable in the aftermath of the German and Italian surrender, the U.K. began to return to normal political life, which..

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