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Why do pasta break into more knots?
The great physicist Feynman once broke a few raw pasta sticks, but unexpectedly found that the pasta would be folded into three or more knots, and never broke into two. This phenomenon has not been well explained for decades.
It wasn't until 2005 that two French physicists, Basile Audo-ly and S ́ebastien Neukirch, gave a theoretical explanation for this. Apply pressure to both ends of the surface, and it breaks at the location where the middle bend is greatest. Because of inertia, fractured pasta bends in the opposite direction until it regains its straightness.
The bending state changes in a very short time and stimulates strong vibrational waves in the surface, which further breaks the noodles into more joints. This process is called cascading fracture in mechanics.
The study earned two physicists the 2006 Funny Nobel Prize in Physics.
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· Rumors about the green fur line snake?
In general, snakes have a lifespan of about 30 years. But have you heard the rumor of the "green fur line snake"? In 1978, the British research vessel Challenger accidentally caught a rare snake while sampling the Mariana Trench in the South Pacific.
Identified by researchers, this is a green fur line snake, the snake has a total of 1687 wheels from beginning to end, this wheel is the basis for calculating age, so the age of the snake is 1687 years old, which is the longest-lived snake known so far.
What is even more surprising is that according to the growth law, the theoretical lifespan of the snake can reach up to 200,000 years.
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· What does vitamin B2 do?
Vitamin B2 is an essential nutrient for the human body, it is an essential substance for the formation of human tissues and organ surfaces, vitamin B2 can not be stored in the human body, but the human body needs it every day, so it must be supplemented from food every day.
Function: 1. Promote development and regeneration of cells; 2. Participate in the growth and metabolism of cells; 3. Cooperate with other substances to participate in a variety of metabolism; 4. Promote growth and development, maintain the integrity of skin and cell membranes; 5. Prevent and eliminate oral reproductive syndrome; 6. Promote the normal growth of skin, nails and hair; 7. Promote the absorption of iron by the body, which can prevent anemia; 8. Improve vision and reduce eye fatigue.
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How did the ancients prevent mosquitoes and repel mosquitoes?
More than 2,000 years ago, "Zhuangzi" recorded: "The skin of the mosquitoes and flies (zǎn) is not sleepy." ”
This means that mosquitoes bite the skin and prevent people from sleeping all night. So how did the ancients prevent mosquitoes and repel mosquitoes?
1. Mosquito nets. In order to make mosquitoes not bite, the ancients invented mosquito nets. 2. Smoky. Ordinary families could not afford mosquito nets, but soon discovered affordable smoked mosquito repellent methods. 3. Fire rope. The initial form of mosquito coils, that is, the use of wormwood, artemisia and other grasses and trees woven into a rope, lit at night when sleeping, with its aroma to drive away mosquitoes. 4. Mosquito coils. During the Qing Dynasty, the production process of mosquito coils was quite mature. 5. Sachets. There are other ways to prevent mosquitoes and mosquitoes at home, but when you go out, you will still be disturbed by mosquitoes, so the ancients invented sachets, which can carry mosquito repellent and decoration.
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· What's wrong about eye protection?
First, myopia without glasses? Many myopic people go out without glasses, which can lead to a deepening degree of myopia. In general, it is normal for adolescents to increase by 50 degrees per year, and more than 100 degrees per year require enhanced protective measures;
Second, long-term use of eye drops? Eye drops have different compositions, should not be used for a long time, the correct way to protect the eyes is to read or use electronic products for about half an hour, close your eyes and rest, blink or look away for 5 to 10 minutes;
Third, is it useless to do eye exercises? When doing eye exercises, you can force the rest of the eyes and relieve eye fatigue; Fourth, the child is small so it is pseudo-myopia? This is the misunderstanding of many parents.
Pseudomyopia actually accounts for only a very small proportion (no more than 3%) of adolescent myopia.
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