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7. When Franklin was seven years old, he was given a lot of money ring a holiday. Franklin plans to use this "huge sum" to buy some toys in the store. On the way, he saw a boy blowing his whistle with great air. He was completely fascinated by the whistle at that time, so he exchanged all his money for the boy's whistle. When he got home, Franklin whistled all over the house with great pride, but he disturbed the whole family. When his family knew about the deal, they told him that for the whistle, he had paid four times more than its original price, and let him understand that the extra money could buy more and better things<

Edison only went to primary school for three months in his life. His knowledge came from his mother's teaching and self-study. His success should be attributed to his mother's understanding and patient teaching since childhood, which made Edison, who was originally regarded as an incompetent child, become a world-famous "king of invention" when he grew up
Edison was curious about many things since he was a child, and he liked to experiment with them himself until he understood the truth. When he grew up, he devoted himself to research and invention according to his own interests. He set up a laboratory in New Jersey and invented more than 2000 kinds of things in his life, such as electric lamp, telegraph, phonograph, video camera, magnetic separator, crusher and so on. Edison's strong research spirit made him make great contribution to the improvement of human life style
"waste, the biggest waste is to waste time." Edison often said to his assistant“ Life is too short. Think more and do more with less time. "
one day, Edison was working in the laboratory. He handed his assistant an empty glass bulb without a light port and said, "you measure the capacity of the bulb." He bowed his head to work again
after a long time, he asked, "what's the capacity?" He didn't hear the answer. He turned his head and saw his assistant measuring the perimeter and inclination of the bulb with a tape measure. He took the measured number and put it on the table to calculate. He said, "time, time, how do you spend so much time?" Edison came over, picked up the empty light bulb, filled it with water, handed it to his assistant, and said, "pour the water in the measuring glass, and tell me its capacity right away."
the assistant immediately read out the number
Edison said, "what an easy way to measure. It's accurate and time-saving. Why can't you think of it? Is it not a waste of time? "
the assistant blushed
Edison murmured: "life is too short, too short. Save time and do more things!"< Before he became famous, Edison was a poor worker. Once, his old friend met him in the street and said with concern, "look, this overcoat on you is not in good condition. You should replace it with a new one."
"do you need it? No one knows me in New York Edison answered with indifference
a few years later, Eddie has become a great inventor< One day, Edison met his friend on the street of New York“ "Oh," exclaimed the friend, "Why are you still wearing this old coat? This time, you need a new one anyway
"do you need it? Everyone here already knows me. " Edison still answered with indifference

one day, there was a big storm. The wind is blowing in the wild, the st is flying, and the mystery is long, which makes it difficult to open one's eyes. Newton thought that this was a good opportunity to accurately study and calculate the wind force

. So he took the equipment and ran back and forth in the storm alone. He was staggering and struggling to measure. Several times the st lost his eyes, several times the wind blew away the paper,

several times the wind made him have to stop working, but did not shake his desire for knowledge. Over and over again, he finally got the right data. He was so happy that he ran home to

, and continued his research. Where there is a will, there is a way. After hard study, Newton laid a solid foundation for his scientific tower. Before long, Newton's mathematical tower was built.

Priestley, the father of gas chemistry, was born in Leeds, England on March 13, 1733. He was raised by his relatives from a poor family. He entered the seminary in 175. After graation, he spent most of his time as a priest, and chemistry was his hobby. He has many works in chemistry, electricity, natural philosophy, theology and so on. He wrote many theological works which he thought he was proud of, but what made him famous forever was his scientific works. In 1764, at the age of 31, he wrote a history of electricity. It was a very famous book at that time. Because of its publication, he was elected a member of the Royal Society in 1766< In 1722, when he was 39 years old, he wrote a history of optics. It is also a famous book in the late 18th century. At that time, he worked as a pastor in Leeds and began to engage in chemical research. His research on gases is fruitful. He used the hydrogen to study the effect of the gas on various metal oxides. In the same year, Priestley also burned charcoal in a closed container, and found that one fifth of the air could be turned into carbonic acid gas. After being absorbed with lime water, the remaining gas would not support combustion or respiration. Because he believed in phlogiston, he called the remaining gas "air saturated with phlogiston". Obviously, he used charcoal combustion and alkali absorption to remove oxygen and carbonic acid from the air and proce nitrogen. In addition, he discovered nitrogen oxide (no) and used it in the analysis of air. Hydrogen chloride, ammonia, sulfite gas (carbon dioxide), nitrous oxide, oxygen and other gases were also found or studied. In 1766, his three volume book experiment and observation of several gases was published. The book details the preparation or properties of various gases. Because of his outstanding achievements in gas research, he is known as "the father of gas chemistry"

in the study of gases, the most important thing is the discovery of oxygen. In 1774, Priestley put mercury soot (mercury oxide) in a glass dish and heated it with a condenser. He found that it quickly decomposed into gas. He thought that what he released was air, so he used the gas gathering method to collect the gas proced, and carried out research. He found that the gas made the candle burn more vigorously, and he felt very relaxed and comfortable breathing it. He made oxygen and proved by experiments that oxygen has the properties of combustion and respiration. However, because he is a stubborn believer of phlogiston theory, he still thinks that air is a single gas, so he also calls this gas "de phlogiston air". Its property is different from that of "air saturated with phlogiston" (nitrogen) found earlier, only because of the different content of phlogiston, so its combustion supporting ability is different. In the same year, he visited Europe, exchanged views on chemistry with lavassier in Paris, and told lavassier about the experiment of decomposing mercury and Silver Ash with a condenser, which benefited lavassier a lot. Lavoisier just repeated Priestley's experiment on oxygen, and connected it with a large number of accurate experimental materials, made scientific analysis and judgment, and revealed the real connection between combustion and air. However, until 1783, when Lavoisier's theory of combustion and oxidation was generally regarded as correct, Priestley still refused to accept his explanation, insisted on the wrong phlogiston theory, and wrote many articles against Lavoisier's view. This is an interesting fact in the history of chemistry. A person who discovers oxygen becomes a person who opposes the theory of oxidation. However, the discovery of oxygen by Priestley was an important factor in the development of chemistry. So chemists all over the world still respect Priestley< In 1791, because he sympathized with the French Revolution, he made several propaganda speeches for the revolution, but he was persecuted by some people, his home was copied, and his books and experimental equipment were set on fire. He escaped alone and took refuge in London, but it was difficult for him to live in London for a long time. In 1794, at the age of 61, he had to move to the United States. Continue to engage in scientific research in the United States. He died in 1804. The people of the United Kingdom and the United States respect him very much, and there are statues of him in Britain. In the United States, the house where he lived has been built into a memorial, and the Priestley medal named after him has become the highest honor in the American chemical instry

Madame Curie

Marie Curie is a French Polish physicist and chemist< In 1898, French physicist Antoine Henri Becquerel discovered that uranium bearing minerals can emit a mysterious ray, but he failed to reveal the mystery of this ray. Mary and her husband, Pierre Curie, worked together on the radiation. Under extremely difficult conditions, they separated and analyzed pitchblende, and finally found two new elements in July and December 1898

in memory of her motherland Poland, she named one element polonium and the other radium, which means "radioactive substance". In order to prepare pure radium compound, Marie cui7e (1867-1934) spent four years to extract 10 mg radium chloride from tons of pitchblende slag, and the relative atomic mass of radium was 225. This simple figure embodies the painstaking efforts and sweat of the Curies< In June 1903, Madame Curie received her doctor's degree in physics from the University of Paris with her doctoral dissertation in the study of radioactive substances. In November of the same year, the Curies were awarded the David gold medal by the Royal Society. In December, they won the 1903 Nobel Prize in physics with becoller< In 1906, Pierre Curie died in a car accident. This heavy blow did not make her give up her persistent pursuit. She enred her grief and redoubled her efforts to complete their beloved scientific cause. She continued her husband's lecture at the University of Paris and became the first female professor of the University. In 1910, her famous book on radioactivity was published. With Mou, she worked with others to analyze pure metal radium and determine its properties. She also measured the half lives of oxygen and other elements and published a series of important works on radioactivity. In view of the above achievements, she won the Nobel Prize in chemistry in 1911 and became the first great scientist to win the Nobel Prize twice in history.

8. At present, there are only 10.7 million BTCs.
at least 1 million of them have been lost. Suppose there are 1 million of the remaining 1 person (Satoshi),
100000 of the remaining 10 people,
10000 of the remaining 100 people,
only 6.7 million. Therefore, I believe that there are no more than 1000 BTCs owned by more than 5000 people in the world,
I'm afraid there are only 5% or 250 BTCs in China