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the wheel is not really old. It was likely developed sometime around 4000 B.C. was new to me.
The combination allows the wheel to be connected to a stable platform. The wheel has very limited utility without the combination of a fixed axle.

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The nails in the past are different from the ones we are using now.
Technology for crafting nails continued to advance.

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1. Human had already made sophiscated work without wheel.
2. What maximized wheel's utility was integration with axle.
3. The first combination with wheel and axle was potter's wheel.

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There were many people related to light bulbs.
So far, Edison was the only one who I knew about the light bulb, but I learn about many people, including Humphry Davy and Joseph Wilson Swan.

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1. The usual nails in 1790s were hand-wrought.
2. The soft iron nails were waned by adopting mass-produce steels.

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1. The inventors of light bulb we use in these days, were more than one person. The light bulb progressed through several steps.
2. The first invent of light bulb was not practical.

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The first wheel was likely developed sometime around 4000 B.C.

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In 1850 an English physicist named Joseph Wilson Swan created a “light bulb” by enclosing carbonized paper filaments in an evacuated glass bulb.

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The invention of the screw is usually ascribed to the Greek scholar Archimedes in the third century B.C.

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Thomas A. Edison improved on Swan’s design.

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The key innovation was not the wheel itself because the combination of the wheel and a fixed axle allowed the wheel to be connected to a stable platform.

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The wheel is developed in Mesopotamia at first.
-The Wheel becomes a valuable invention with the fixed axel.

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The key invention is not itself wheel but combination of wheel and fixed axle. This combination means that before combination, the wheel's utility isn't high because of speed and pause

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고정된 축(axel)이 없다면, 바퀴는 아주 제한적인 유용성을 가진다.

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After Henry Bessemer developed a process to mass-produce steel from iron, the iron nails of yesteryear slowly waned and by 1886, 10 percent of U.S. nails were created from soft steel wire, according to the University of Vermont.

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-Nails are developed in the Ancient Roman period at first. However, they are only used to cast and shape metal.

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Before invention of nails, wood structures were fixed to interlocking adjacent board. During 1790s-1800s, people use hammering to create a point. Iron nails were created from soft steel wire

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바퀴 그 자체보다 축이 더 중요한 발명이라는 사실을 알게 되었다.

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It is new to me that the wheel and axle combination were developed in Mesopotamia , such as today's Iraq, Kuwait, Turkey, and Syria, sometime around 4000 BCE.

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I was surprised that humans could develop the wheel when designing complex instruments. It was even around 4000 B.C. that they were casting metal alloys. I realized early humans had been much smarter that I thought.

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-They were pioneered in the early 19 ceutury by Humphry Davy.
-Thomas A.. Edison was just filed patents for electric lights using differnet materials for the filament.

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Joseph Wilson create a' light bulb ', which enclose carbonized paper filaments in an evacuated glass bulb.

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The wheel itself is not an innovative invention.

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Before the nail, wood structures had to be built by interlocking adjacent boards geometrically a much more arduous construction process.

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It was interesting that hand-wrought nails were the norm until 19 century even after the industrial revolution.

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The first wheel was likely developed sometime around 4000 B.C. By that time, humans were already casting metal alloys, constructing canals and sailboats, and even designing complex musical instruments such as harps.

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I did not know that human had the ability to cast and shape metal back more that 2000 years. During the Ancient Roman period, they became possible to develop it.

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나사의 역사에 대해서 알게 되었다. 나사가 언제부터 만들어졌는지와 이를 만드는 기계에 대해서 새로이 알게 되었다.

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It was new to me that electric lights and lightbulbs are different.

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I learned that Thomas A. Edison improved vacuum pumps to develop a longer-lasting lightbulb. However, in fact, an English physicist named Joseph Wilson Swan created a 'light bulb', which was enclosed carbonised paper filaments in an evacuated glass bulb. Thanks to him, light bulbs could have a better lifetime for commercial uses.

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I didn't know that wheels are invented in Mesopotamia. Also, I was shocked that wheel itself wasn't a great invention but, combination of the wheel and a fixed axle, which allows the wheel to be connected to a stable platform was.

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Without the good vacuum, Edison's bulb would have a short lifetime for commercial use.

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바퀴와 축의 결합체를 처음 사용한 것이 도공이였다는 것을 이 글을 통해 처음 알게 되었다.

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에디슨이 전구를 온전히 창작해낸 것이 아닌 기존의 아이디어를 발전시켰다는 것을 알게 되었다.

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The form of the nails we usually use nowadays were made in soft steel wire.

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바퀴가 발명 된 당시에 이미 복잡한 악기들이 발명 되어 있었다는 것.

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I have always thought that Edison was the inventor of light bulbs. It was quite shocking that bulbs were invented by Humphry Davy in the early 19th century!

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Before the invention of the nail, the house was built by connecting wooden structures.

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It is new to me that Henry Bessemer developed a process to mass-produce steel from iron. After that, the iron nails of yesteryear slowly waned and by 1886, 10 percent of U.S. nails were created from soft steel wire.

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현재와 같은 못이 된 것은 다른 발명품에 비해 비교적 최근이라는 것

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Light bulbs were created shortly after the invention of artificial light.

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When Humphry Davy connected wires between his battery and a piece of carbon, the carbon glowed, producing light and his invention was known as the electric arc lamp.

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대장장이가 정사각형 철 막대를 가열한 다음 4면에 망치로 쳐서 포인트
를 만들었
다.

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에디슨의 발명 이전에도 전구는 있었지만, 필라멘트가 자꾸 끊어져서 지속적으로 사용되지 못했다는 것

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I had never thought wheels are great inventions... but after I read this passage I changed my mind. I first learned Wheels were developed around 4000 B.C. It's also amazing that wheels cannot work without a fixed axle.

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If the wheels were not in the world, if the wheels had not formed a circle shape, the appearance of our lives now would have been distinctly different from what we are today. The creation of wheels allowed humanity to become more colorful by the means of transport, allowing us to see that distance constraints between movements were lost.

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I could be aware that Nail is inevitably used in every element that makes up the world today. In working in various fields such as architecture, woodworking, and marine industries, it became a connecting point between objects, and it was able to help us improve the direction of our lives more.

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The light bulb realized its greatness in Edison’s greatness, which I read as a child, and this time I could realize it as well. Although humanity’s activity restrictions were limited during the day, this ‘light bulb’ was created, allowing mankind’s limitations of activity to fully enjoy 24 hours day and night. Therefore, I think humanity has been able to develop faster and more innovatively through this.

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The first device to use the wheel and axle combination was developed in Mesopotamia sometime around 4000 BCE. It was a surprising fact that the wheel system was used even in the immemorial period.

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I had never thought nails are great inventions too... Because I didn't know making nails is really hard in the 1790s and early 1800s.

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다른 발명가들도 "전구"를 만들었다. 그러나, 사용된 필라멘트는 며칠 사용 후에 깨지는 경향이 있어 비실용적이었다.

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I had believed that Thomas A. Edison was the pioneer of Electric Lights. However Electric Lights were pioneered in the early 19th century by Humphry Davy, who experimented with electrictity and invented and electric battery.

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I didn't know that before Edison develop light bulbs, there were a lot of tries to create light bulbs. And now I don't understand why not Swan but Edison is known as a person who made light bulbs first.