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Οδηγίες χρήσης padlet 

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Οδηγίες χρήσης padlet 

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Πατήστε στο + (ή στο μολύβι ή κάνετε διπλό κλικ πάνω στον ελεύθερο χώρο της σελίδας) στο κάτω δεξιά μέρος της σελίδας. Θα σας ανοίξει νέο κουτί στο οποίο μπορείτε να δουλέψετε. Γράφετε τίτλο με το όνομά σας δίπλα και το κείμενό σας από κάτω. Τα κείμενα στα Αγγλικά παρακαλώ, έστω και πολύ απλές προτάσεις. Μπορείτε επίσης στο κάτω μέρος του κουτιού να προσθέσετε εικόνες, videos και συνδέσμους! Μπορείτε τέλος να προσθέσετε σχόλια (comments) και stars στις παρουσιάσεις των συμμαθητών σας.

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Before the discovery of penicillin by Alexander Fleming.

Many diseases, from syphilis and gangrene to rheumatic fever, have killed thousands of people each year.The Scottish scientist discovered penicillin in 1928 and created a new field in medicine, antibiotics.
Penicillin was one of the discoveries that significantly improved people's lives and since it was discovered, it has changed the world.

In general, these discoveries took humanity forward and made the world as we know it.

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Helicopter were developed and built during the first half-century of flight with the Focke-Wulf Fw 61 being the first operational helicopter in 1936. Some helicopters reached limited production, but it was not until 1942 that helicopter designed by Igor Sikorsky reached full-scale production, with 131 aircraft built. Thought most earlier designs used more than one main rotor, it is the single main rotor with anti-torque tail rotor configuration that has become the most common helicopter configuration. Tandem rotor helicopters are also in widespread use due to their greater payload capacity. Coaxial helicopters, tiltrotor aircraft, and compound helicopter are all flying today. Quadcopter helicopters were pioneered as early as 1907 in France, and other types of multicopter have been developed for specialized application such as unmanned drones

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The invetion of telephone [by Fotini Gavera]

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The invetion of telephone [by Fotini Gavera]

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Alexander Graham Bell was the man who invented ''the telephone'' in 1876. He was born in Scotland but he emigrated to Canada with his parents because he had problems with his health. He was teaching Vocal Physiology and Elocution at the university of ''Bostom'' for many years while he was making experiments with new methods. In 1876, Graham Bell with his partner Thomas Watson suceeded to invent something new ''The Telephone'' which changed our way of life.

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Benjamin Franklin and Electricity (by Thanos Katsigiannopoulos)

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Benjamin Franklin and Electricity (by Thanos Katsigiannopoulos)

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Benjamin Franklin (1706-1790) was interested in electricity. Being a curious and inventive thinker, Franklin kept thinking about electricity and came up with a very important idea.

His idea was about electricity and lightning. Franklin noticed several similarities between the two: They both created light, made loud crashes when they exploded, were attracted to metal, had a particular smell, and more.

He made a plan for how to prove that electricity and lightning were the same. His plan required something tall, like a hill or a tall building, but Philadelphia had neither at the time. While Franklin was waiting for a tall building to be built, he came up with another plan. This one involved a key and a kite.

Franklin needed something to get close enough to the clouds to attract the lightning. He did have a silk handkerchief, a couple of sticks and some string, so instead of getting himself up near the lightning, he flew a kite up to it. And it worked! Franklin proved that lightning and electricity were the same thing.

But that wasn't enough for Franklin. He believed that this knowledge should be used for practical purposes.

What could be practical about lightning? Many folks knew what wasn't practical: having your house burn down because it was struck by lightning. Franklin thought he could help. He knew that lightning usually hit the highest part of a building. He also knew that the electrical current in lightning could start a fire. So he invented the lightning rod.

A lightning rod is made of metal and is attached to the highest point on a house. The lightning hits the rod instead of the house, and the electrical current from the lightning goes into the ground and leaves the house undamaged. Franklin thought the lightning rod was his most important invention.

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Benjamin Franklin for Kids – Ben Franklin Kite Experiment – Electricity for Kids

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One of the most important appiications of the 20th century is the airplane.The first airplane  was built by the Wright brothers in 1903.The plane without doubt changed the lives of many people for the better.
With the plane people can travel and get to their destination easly and quiqle.
So, they have the opportunity to meet new people end cultures knowledge.
At the same time, they can address health problems more quiqly and expand  ther proffesional activites.
Finally, they can get in touch with their relatives and friends who live in another place than theirs.

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A car (or automobile) is a wheeled motor vehicle used for transportation. Most definitions of cars say that they run primarily on roads, seat one to eight people, have four tires, and mainly transport people rather than goods.[2][3]

Cars came into global use during the 20th century, and developed economies depend on them. The year 1886 is regarded as the birth year of the modern car when German inventor Karl Benz patented his Benz Patent-Motorwagen. Cars became widely available in the early 20th century. One of the first cars accessible to the masses was the 1908 Model T, an American car manufactured by the Ford Motor Company.Cars have controls for driving, parking, passenger comfort, and a variety of lights.
So cars are usefull but also dangerous and invironmental unfriendly.

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The washing machines are a home aplliance used to wash laundry.The history of the washing machine goes back to the earliest civilization ,as people tried to find the best ways to wash their clothes, first in streams of running water and then in ever more sophisticated wash-house and tanks.
We owe the invention of the washing machine to Jacob Cristian Schaffer (1767). 30 years later,an American,Nathaniel Briggs, obtained the first patent of a washing machine. It involved pouring hot water into a tank,turning a lever to wash the clothes and then wringing them between two rollers. The tank was then drained using a tap.
210 years further on, the electric washing machine was invented. Nowdays waching machines offer dozens of wash cycles and wash levels, programmable before or during washing.

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The earliest exist record of a telescope was a 1608 patend submitted to the gamernmet in the Netherlands by Middelburg spectacle maker Hans Lippershey for a refracting telescope.
The actual inventor is unknown but word of it spread through Europe. Galileo heard about it and, in 1609, built his own version, and made his telescopic observation of celestial objects.
The idea that the objective, or light gathering element, could be a mirror of a lens was being investigated soon after the investion of the refracting telescope.

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Television is one of most popular invention in the world. It was invented by a Scottish scientist whose name was John Baird in the 19th century. At first television snowed black and white pictures. Today it has change a lot and has many interesting programmers watch. Films, show and the news. Children can watch cartoon and documentaries. Also, TV is companion for older people who feel lonely. Television is a nice way to spend their free time and learn interesting things.

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Benjamin Franklin was the men who invented the electricity.He was born in 1706 and he was died in 1790 [aged 84].He was born in Boston, Massachusetts and he was died in Piladelphia, Pennsylvania. Benjamin Franklin died  from  pleuritic attack at his home in Philadelphia on April 17,1790. Franklin suffered from obesity thoughout his middle-aged and later years,which resulted in myltiple health problems,particurarly gout,which worsened as he aged.

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Television (TV), sometimes shortened to tele or telly, is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in color, and in two or three dimensions and sound. The term can refer to a television set, a television program ("TV show"), or the medium of television transmission. Television is a mass medium for advertising, entertainment, news, and sports.Television became available in crude experimental forms in the late 1920s, but it would still be several years before the new technology would be marketed to consumers. After World War II, an improved form of black-and-white TV broadcasting became popular in the United States and Britain, and television sets became commonplace in homes, businesses, and institutions. During the 1950s, television was the primary medium for influencing public opinion. In the mid-1960s, color broadcasting was introduced in the US and most other developed countries. The availability of multiple types of archival storage media such as Betamax and VHS tapes, high-capacity hard disk drives, DVDs, flash drives, high-definition Blu-ray Discs, and cloud digital video recorders has enabled viewers to watch pre-recorded material—such as movies—at home on their own time schedule. For many reasons, especially the convenience of remote retrieval, the storage of television and video programming now occurs on the cloud. At the end of the first decade of the 2000s, digital television transmissions greatly increased in popularity. Another development was the move from standard-definition television (SDTV) (576i, with 576 interlaced lines of resolution and 480i) to high-definition television (HDTV), which provides a resolution that is substantially higher. HDTV may be transmitted in various formats: 1080p, 1080i and 720p. Since 2010, with the invention of smart television, Internet television has increased the availability of television programs and movies via the Internet through streaming video services such as Netflix, Amazon Video, iPlayer and Hulu.https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcReOks1y-msmjMAIW1DuGgx4HjsnqndHpxRWmimrI1Fpo2qDxmJ&usqp=CAU

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The wheel stands out as the og of enigineering marvels and one of the most famous inventions that infiuenced numerous other things.This primitive technology made it easier for all of us to travel.From the archeological excavations,the oldest know wheel is from mesopotamia,aroud 3500B.C. As a result of advencement in the new and innovatne desing of wheels, industrializantion could take root. the wheei serves a vital purpose in our lives, and we could't imagine the worid without them.