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Cellphone A cellphone is any portable telephone that uses cellular network technology to make and receive calls. The name comes from the cell-like structure of these networks. There is some confusion about cellphones being classified differently from smartphones. Still technically, every mobile phone, from the latest Android handset to the simplest feature phone, is a cellphone. It's all about the technology used to transmit your calls, rather than what the handset itself can or cannot do. As long as a phone can send a signal to a cellular network, it's a cellphone. Do you remember a time when cell phones were rare? Today, it's hard to imagine a world without them. Even if you don't own one yourself, you probably see dozens of people talking on a cell phone every day. The rate at which we adopted the devices is astounding. But who invented them? The first phone call made on a handheld cellular phone was made on April 3, 1973. The first handheld cellular phone call was made on April 3, 1973, by Motorola engineer Martin Cooper from Sixth Avenue in New York while walking between 53rd and 54th streets People also ask
What led to the development of cell phones? Cooper wanted people to have freedom to talk on the phone away from their cars. So in reaction, he and Motorola embarked on a project to create a more portable device. Motorola spent three months building a prototype for a portable, mobile handset that Cooper publicly demonstrated in April of 1973. Science concept behind cellphone A microchip in the phone modulates (or varies) a radio wave using the electrical signal. The radio wave travels through the air to a nearby cell tower; the tower sends your voice to the person you are calling and the process is reversed so that the person on the other end can hear your voice. The mobile phones of today’s age are portable. They are providing assistance to society as a whole not only by connecting family and friends together but also by helping businessmen and professionals arranging and conducting meetings with the help of this gadget. Cellular phones have the honor to increase the flow of information in society to a great extent. Over the years, cell phones have become an important component of our lives. It is not just a mode of communication anymore but much more than that. A cell phone is also, alternatively, known as a cellular phone, mobile phone, or portable phone. Primarily, it enabled its users to communicate anywhere in the world. However, with the passage of time, now mobile phones have not only replaced landline phones but also cameras, radios, computers, and calculators, etc. From ‘want’, cell phones have become the ‘need’ of human beings. This is the reason that the importance of cell phones has increased over the past decades
Digital Camera The history of the digital camera started in 1961 with Eugene F. Lally of NASA's Jet Propulsion Laboratory. When he wasn't working on artificial gravity, he was thinking about how astronauts could figure out their position in space by using a mosaic photosensor to take pictures of the planets and stars. Lally actually figured out how to solve red eye in photos, but unfortunately his theory of digital photography was still way ahead of the existing technology. It was the same story 10 years later when Texas Instruments employee Willis Adcock came up with a proposal for a filmless camera (US patent 4,057,830). It wasn't until 15 years later that the digital camera became a reality. Steve Sasson is an electrical engineer who invented the digital camera while working for Kodak. The Rochester, New York, company, which had made its fortune by selling photographic film and paper for most of the 20th century, did not think that Sasson’s digital camera had any place in photography, and that lack of foresight ironically put Kodak out of business. The resulting camera, pictured in 2007 on its first trip to Europe, was the size of a printer and weighed nearly 4 kilograms. It captured black-and-white images on a digital cassette tape, and Sasson and his colleagues also had to invent a special screen just to look at them. Today's Apple iPhone 12 lineup has 12-megapixel cameras. That's 12 million pixels in an image. Kodak's prototype had a resolution of 0.01 megapixel. It also took 23 seconds to snap the first digital photograph.
Arithmometer Arithmometer, early calculating machine, built in 1820 by Charles Xavier Thomas de Colmar of France. It was the first commercially successful calculating machine capable of performing addition, subtraction, multiplication and division.
