If you want to ask what is the most beautiful printed matter in a country, the answer must be the banknotes issued and circulated in that country. The earliest appearance of banknotes can be traced back to jiaozi, which was used in Chengdu, Sichuan Province in Song Dynasty. However, the large-scale use of banknotes was still the banknotes issued in the name of the state after the emergence of modern central bank. After replacing gold as the standard of value judgment, paper money plays an important role in a country's economic activities. The right to issue paper money has become a symbol of a sovereign country. A country is very cautious when issuing banknotes. It will carefully consider the patterns on the banknotes and the printing methods. Each country will choose the people or things that can best express its own national characteristics as the pattern content of the banknotes. Therefore, banknotes can usually reflect the values and spiritual connotation of a country as a whole.

Due to the different systems, cultures, histories, natural conditions and values of different countries, the patterns on banknotes are extremely rich. Almost no one can completely collect banknotes from all countries in the world. Many collectors can only choose one special field for collection and research. In foreign countries, there is a kind of collection and research with scientists as the theme, which has gradually attracted people's attention in recent years. The paper money has a wide range of liquidity, and is exquisitely printed. Taking scientists as the content theme of the paper money can strongly express a country's respect for scientists and yearning for exploring the secrets of nature. In the process of circulation, the paper money can imperceptibly convey a country's and nation's attitude towards science to the people of the whole country. The circulation process of the paper money is the process of continuous transmission of scientific spirit . Some people say that "money can corrode human beings", but these scientists can use their wisdom to illuminate people's hearts. The author studied in the Department of physics of Sichuan University, and is now engaged in the research of physics and quantum optimization algorithm. In recent years, he has collected foreign banknotes with physicists as the theme. In the world, people with the same collection topics include Edward F Redish) and Jacob Lewis bourjaly, a theoretical physicist at the Niels Bohr Institute in Copenhagen, Denmark. From the perspective of collection groups, this kind of collection is mainly made up of scientists in the professional field, which is because there are certain requirements for professional knowledge to understand the content of banknote patterns.

Europe is the birthplace of scientific spirit. The attitude of ancient Greek philosophers towards science is very pure. Their purpose of thinking about the nature of the world is only to be curious about nature from the heart, not to be applied. In ancient Greece, there is almost no distinction between philosophy and science. It began in the 1860s, and the industrial revolution took place in England, which made Europe a world science The great changes in quantum mechanics and relativity in the 20th century were also centered on Europe. Scientific spirit has a profound historical accumulation and cultural soil in Europe, so the countries that use scientists as the theme of paper money are mainly concentrated in Europe. Almost every country in Europe has scientists who have made great contributions to human history, and they have a lot of space in the choice of characters. In 2018, the Bank of England, the Bank of England, launched an unprecedented vote to identify the subject of 50 pounds by the scientists nominated by the public. After the nomination vote started, the public actively participated in the nomination. 227299 people successively participated in the nomination, a total of 989 scientists were nominated, and finally 12 scientists were selected as candidates, including Hawking, Maxwell and Dillard He was a physicist. On July 15, 2019, the governor of the Bank of England, mark Carney, announced that the image of Alan Turing had been chosen as the theme of the UK's largest 50 pound figure. "Alan Turing is an outstanding mathematician, and his work has had a great impact on our lives today," he said in a statement. As the father of computer science and artificial intelligence, and a war hero, Alan Turing's contribution is far-reaching and groundbreaking. He is a giant shouldering so many achievements. " The Bank of England even organized children's design competition for new banknotes (Note: the new 50 pounds will be made of plastic), encouraging children to express their understanding of the scientist with their own brushes. The seeds of scientific spirit will be deeply buried in these activities. As the most serious, formal and important printed matter in a country, the role of paper money far exceeds its own value. It can be used as the best medium to convey a country's attitude towards science. Wherever it circulates, the seeds of scientific spirit will be sown.

The currency, authority and richness of content presentation of banknotes are not possessed by other media, such as coins. Although coins also have currency and authority, the presentation means of coin content is far less than banknotes, and the appreciation value and artistic value are difficult to achieve the effect of banknotes.

The scientist on the D-series one pound note issued and circulated by the Bank of England in 1978 was Isaac Newton, the founder of modern classical mechanics and the proposer of gravitation. In this note, Newton sat under an apple tree, holding the most important book of his life, the mathematical principles of natural philosophy, a reflective telescope he invented, and the glass prism he used to discover the principle of refraction. These objects correspond to the landmark achievements of Newton's life. People who are familiar with Newton can immediately associate with Newton's corresponding scientific achievements when they see these objects. The designer of the note was Harry Ecclestone, the Bank of England banknote designer Eccleston) as like as two peas in the book, which is the most interesting thing in his book, Newton's book is just the geometric figure on the left side of Newton, and this geometric figure is exactly the same as that in Newton's original book. Newton proved that the centripetal force is inversely proportional to the square of the distance between the object and the focus when the object is elliptical in focus. The calculation of planetary orbits is an important application of this theorem. It can be seen that the designer has made great efforts in the design.