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Anonymous users2024-02-07The world's four major scientific problems.
There are four of the world's biggest scientific puzzles, and scientists from all disciplines around the world are trying to unravel these secrets of nature, and if these mysteries can be solved, human life and the way we think about the world will change fundamentally.
1. Human genetic structure.
Human genes are stored in a large molecule in a spiral. Scientists now want to know exactly what information is stored in which genes, because each gene is made up of about 30,000 pieces of information and has to be examined one by one, and only now have 100 of the approximately 100,000 genes identified. A few days ago, scientists have unraveled the entire genetic code of a volunteer, and if all the secrets of the genes can be revealed, then cancer, diabetes and other more than 4,000 genetic diseases caused by genetic damage can be repaired by repairing the genes.
2. Dark matter in the universe.
According to new calculations, there is nine times more matter in the universe than astronomers see today, and the theory of the universe can be established. However, it is completely unknown what these substances are, what they are composed of, and whether a large amount of dark matter can still be found.
3. Controlled nuclear fusion.
6 tons of coal can be produced from 7 grams of hydronuclear fuel, and the hydrogen fuel is extracted from water, which is inexhaustible, and the harm to humans and the environment is only 1% of the current energy source. Although the theoretical problems have been solved, the practical problems have not been solved. The premise of hydrogen fusion is 100 million degrees Celsius, how to build a furnace that can withstand such high temperatures.
4. The origin of life.
American scientist Miller mimicked the conditions on Earth 4 billion years ago, and as a result, amino acids were produced under these conditions, --- building blocks of life. But how it evolved into life is still a mystery, and now computer scientists have programmed artificial organisms to observe the origin of "life" in the computer world, which they believe is the first step in understanding the structure of life, and the goal of the future is to simulate the formation of life.
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Anonymous users2024-02-061. Are all the dimensionless parameters that express the characteristics of the implicit physical world incalculable in principle, or are there some parameters that depend only on historical or quantum mechanical contingencies, and therefore cannot be calculated?
2. How does quantum gravity help explain the origin of the universe?
3. How long is the lifespan of protons, and how to understand it?
4. Is nature supersymmetrical? If so, how did the supersymmetry break?
5. Why does Huai Wang's universe manifest itself as one dimension of time and three dimensions of space?
6. Why does the cosmological constant have its own value? Is it zero, is it really constant?
7. What is the basic degree of freedom of M theory? Does this theory really describe nature?
8. What is the solution to the black hole information paradox?
9. What kind of physics can explain the huge gap between the gravity of elementary particles and their typical masses?
10. Is it possible to quantitatively understand the quark and gluon constraints and the existence of mass gaps in quantum chromodynamics?
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Anonymous users2024-02-05The three major challenges facing the world today are climate change, the gap between rich and poor, and the global health crisis. Climate change is one of the most urgent and significant challenges facing humanity, triggering extreme weather events, rising sea levels and ecosystem collapse that require a global response. The gap between the rich and the poor is a key issue for social stability and sustainable development, and the global inequality in the distribution of resources, economic inequality, and social injustice have made the gap between the rich and the poor continue to widen, and it is necessary to promote inclusive growth and social justice.
The global health crisis has exposed the fragility of public health systems, and outbreaks and infectious diseases threaten global human health and economies, requiring international cooperation to strengthen health infrastructure and response capacity.
Where did you hear the statement of the eight major aircraft manufacturers? Am I lonely? However, the statement of the fifth floor is completely incorrect, the countries in the world that are fully capable of manufacturing military aircraft on their own are Russia, the United States, China, the United Kingdom, France, Germany, Sweden, Japan, Israel, India, Brazil, etc., the countries listed here are just saying that they have the ability to manufacture, whether they have been built is another matter, the world's famous military aircraft manufacturers (including ***) have Lockheed Martin, Northrop, Boeing, Dassault, Sukhoi (Sukhoi), Mikoyan Grevich (MiG), Tupolev (picture), Antonov (An), Ilyushin (Il), Miri (M), Kamov (Ka), Yakovlev (Jacques), British Aerospace, European Group, EADS, Sikorsky, Bell, McDonnell Douglas, Grumman, Hughes and many more.
If the height is measured from the base to the summit, the highest mountain in the world is Mauna Kaia, a giant volcano in the Hawaiian Islands. When measured from sea level to the summit, the highest peaks are clustered in the Himalayas. Twenty thousand and three hundred and twenty feet above sea level. >>>More
Chamberlain, 100 points, Jordan's 10-time scoring champion.
The largest animal in the world: if by weight the largest is the blue whale ; If it is by area volume there is no doubt that the Arctic Xia jellyfish :) although he went to the water without a few pounds. >>>More
The smallest fruits.
The smallest fruit in the world – floating duckweed. The total length of the whole plant is less than 1 mm. The fruit weighs only 70 mg. It's smaller than a regular grain of table salt. >>>More