In the 1950s, desktopcomputers were invented in the same country.They became smaller and could be put onthe desk. Since then, they have become veryComputerimportant in many fields of work and leisure.Before the 1970s, the computers were single. Itwas the Internet that joined the computers ...
由第二栏中The first TV set was invented by an English scientist, John Baird, in 1926. The invention helped people watch films at home instead of going to the cinema as before.可知第一台电视机是一个英国科学家约翰贝尔德,在1926年发明的。这个发明使得人们在家看电影而不是去电影院,可知在1926年...
He succeeded in 1938, and marketed his revolutionary device to about 20 companies before he could interest any. The Haloid Company (later called the Xerox Corporation) marketed it, and photocopying eventually became common and inexpensive. Carver, George Washington George Washington Carver (1865?-...
The Apple II, Commodore PET, and Radio Shack’s TRS-80 are introduced in 1977—four years before IBM, soon to become synonymous with the term “PC,” unveils its personal computer. Advertisement - Continue Reading Below Science & Society Picture Library//Getty Images 1978: GPS The first sate...
An American, Thomas Edison, invented the first practical light bulb. From then on, at night, people can do nearly all the things they can do in the daytime with the help of the light bulb. They don’t have to hurry to do what they need to do before it’s dark.【1】What are ...
What do we know about the cost of TV sets before 1955? A. It was beautiful. B. It was boring. C. It was high. D. It was low.14. Which of the following is TRUE? A. In the 1930s, it became very easy to receive TV signals. B. During World War [I . TV sets went into ...
Amazingly, this was a very simple ide a which no one tried before.The three-point seat belt was introduced on Volvo cars in 1959. For more people's safety, Volvo made the new seat belt design available to other car makers for free. Since then, engineers have worked to improve the ...
Before the 1970s, the computers were single. It was the Internet that joined the computers into a big family, so they could share information with one another. Around 1985, laptops were developed in Japan. They were much smaller and could be put on people's laps. They were light and ...
The situation becomes more alarming when one considers the fact that cleanup wasn't a priority during the heyday of NASA's shuttle program before the mid-1970s [source: Waymer]. In fact, trike waste was placed into the ground, under the assumption the compound would evaporate (it didn't)...
structureofDNAThiswasadiscoveryofFrancisCrickandJamesWatsonandpublishedin1953.ThesetwoscientistswerethefirsttoshowthatourgenesconsistoftwospiralsofDNA(calledthedouble-helix).Thisworkleddirectlytothehumangenomeprojectin2003,whichdiscoveredtheStructureofDNA.Doyouknowthestageseveryinventormustgothroughbeforetheycanhave...