The original meaning of computer is "calculator", that is to say, human beings will invent computers with the original purpose of helping to deal with complex digital operations. The concept of manual calculator can be traced back to Pascal, a great French thinker in the 7th century. Pascal's father is the tax director. At that time, the monetary system was not decimal, so it was very troublesome to calculate. Pascal used the gear principle to assist his father and invented the first calculator that can add and subtract. Later, the German mathematician Leibniz improved it and invented a calculator that can do multiplication and division. After that, although the function of the calculator was improved and refined, the real electric calculator could not be manufactured until AD 1944.
The first machine that can really be called a computer was born in the United States in 1946. It was invented by Mao Qili and eckert, and its name is ENIAC. This computer uses vacuum tubes to process signals, so it is huge (occupying one room) and consumes high power (everyone in the town knows when to use it, because the lights in every household are dimmed! ), and the memory capacity is very low (only 100 words), but it is already a great progress in human science and technology. And we usually call this kind of computer using vacuum tube the first generation computer.
The first generation computers were as big as two classrooms and much smaller than the personal computers we usually use now. At that time, the computer part was a vacuum tube (now I can't find it), and what was archived was punch cards. Without the design concept of predecessors and the invention of computers, it is still difficult to define who invented computers.
Dinosaurs were first discovered by British doctor Mandel in 1822. This is the tooth of Iguanodon. After that, westerners began to study dinosaurs. 1842, the biologist Owen named this creature dinosaur, which was translated into dinosaur in Japan and then introduced to China.
There are dinosaur fossils everywhere. There are also many dinosaur fossils in the desert. Other forests, grasslands, farmland, river valleys, mountains and so on are everywhere, but there are many. China and the United States have the most. Dinosaurs found in China are concentrated in Zigong, Sichuan and Erenhot, Inner Mongolia, which are the most abundant places. Other dinosaurs have been found in Wuerhe in Xinjiang, Huayang in Shaanxi, Qingdao in Shandong, Lufeng in Yunnan and Manjiang in Heilongjiang. There are no dinosaurs in Yuxian County, Henan Province, but there are many dinosaur eggs. So far, about 6000 dinosaur eggs and 5000 dinosaur eggs have been found there. The earliest dinosaur eggs were discovered by Americans in Mongolian Gobi Desert (which belonged to China at that time) in 1922. They are protoceratops's eggs, and the egg-stealing dragon has also been found.