Doubt is the beginning of thinking and the end of learning. Major breakthroughs in science, major creations in theory and major inventions in technology often begin with "doubt".
"Why did the apple fall to the ground?" This kind of "doubt" has great enlightenment for Newton who explored "gravity"; "The water is boiling, why does the lid jump out?" This "doubt" made Watt discover the power of steam; "No matter how big or small the chandelier is, why is the time the same?" This "doubt" led Galileo to discover the principle of isochronism. These natural phenomena are common in people's lives, however, ordinary people turn a blind eye to them, and only people with the spirit of exploration will doubt them, explore hard, and even make discoveries, inventions and creations. Zhang Zai, a thinker in the Song Dynasty, put it well: "There is no doubt that there is doubt, and this is the only way forward!"
Suspected traces can't be ignored. Seeing "doubt" is never "taboo", but "doubt" When you see doubt, subjective speculation and strong ignorance, you will miss the truth and regret it for life. When studying the extraction of iodine from seaweed, Libixi found that a dark brown liquid with a pungent smell precipitated from the bottom of the mother liquor. Libby took it for granted that this was just "iodine chloride". Later, when doing the same experiment, Frenchman Pollard carefully studied this dark brown liquid and found that it was not "iodine chloride" but a new element-bromine. This incident taught Leigh Bischel a profound lesson. He mentioned this in his autobiography and said, "From now on, unless there are very reliable experiments as the basis, I will never make up my own theory out of thin air."
We should be good at learning and dare to doubt the "known" achievements left by our predecessors. Aristotle once asserted that object C fell from the sky, "the speed is directly proportional to its weight". This assertion has been circulated for 1800 years. Galileo tried to test whether it was true through practice again. He took two iron balls of different sizes, ran to the leaning tower of Pisa and threw them down. After repeated experiments, Aristotle's assertion was proved to be wrong. Not only that, Galileo also mastered the motion orbit of objects and promoted the development of mechanics. Only by daring to doubt the authoritative conclusion can we hope to break through the unknown barriers and open the door to truth. Without doubting the conclusion that "electromagnetic waves will never return through the air layer", Marconi could not try to send signals across the Atlantic without wires, nor could he start a radio service; Harvey would not have discovered the truth of human blood circulation if he did not doubt Green's statement that human blood is "consumed all over the body". The discovery of magnetic field and atomic energy, the theory of relativity and quantum theory, the theory of biological evolution and the establishment of the periodic table of elements are all the results of daring to challenge the authority's wrong judgment.
"Doubt" means emancipating the mind and thinking independently, that is, advocating scientific exploration, not making arbitrary judgments by subjective speculation, not being bound by old rules and regulations, daring to think, dare to do and dare to "reverse heaven and earth and lift it up again" in science. This is not a nihilist who doubts everything, but a conclusion that does not cling to all authority. In the new century, we should all dare to doubt and be good at it.