Want to watch scientists challenge magicians? Do you want to uncover the secrets behind the bizarre videos in your circle of friends? On June 25, Institute of Physics, Chinese Academy of Sciences held a Public Science Day event, starting an interesting scientific journey "on the cloud". There are no unsmiling physics teachers here in , only humorous scientific geniuses who tear off the "cold" veil of physics knowledge in a cool way.
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Strange skills to blind the eyes Science challenges magic
Lighters, playing cards, water cups, these common supplies can also show extraordinary magic in the physical world. Station B’s UP host “I Am Weird King” used these props to distract us at the exact time and appropriate angle, and the “miracle” happened instantly.
But these "tricks" were solved by Yang Zhenghong, an associate researcher at the Institute of Biophysics, Chinese Academy of Sciences, using scientific knowledge. "More than 80% of human beings' external information is obtained through vision. When we watch magic, vision dominates and sound is auxiliary." Yang Zhenghong said that the "time resolution" of the human eye is about 1/16 seconds. If the magician's hands The speed is faster than 1/16 seconds, even if you don't blink, you can't see the flaw.
Another example is a movie. It is actually composed of slides one by one, but we still feel smooth and smooth while watching the movie. The reason is that its playback speed is about 1 second and 24 frames, which is much faster than the resolution speed of the eyes. .
Yang Zhenghong also conducted an experiment in which patients with cortical blindness were asked to walk from one location to another with obstacles set up between the two points. The results showed that they could bypass the obstacles and reach the end.
"In fact, they can see, but they don't realize that they can see. In other words, their brains don't know that they see." Yang Zhenghong said that this is because the primary visual cortex of patients with cortical blindness does not analyze these signals.
People with Anton syndrome are just the opposite. These patients really can't see, but they think they can. "Part of the visual pathway of this kind of patient passes through the language pathway. It is precisely because there is a problem with the language pathway that they repeatedly describe what they saw." Yang Zhenghong said.
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Experimental talk scientifically clarifies rumors
Can bubbles dance on your hands? Blindfolding your eyes and covering your nose, you can't taste the taste of carbonated drinks? Experiments can verify it.
If you catch the bubbles blown by the bubble machine with your bare hands like a child, you will probably be disappointed. "The formation process of bubbles requires a stable distribution of water's surface tension . The oil on our hands will destroy this weak balance, and the bubbles will easily burst. " said Fan Zhen, a doctoral candidate at the Institute of Physics, Chinese Academy of Sciences.
It’s different when you put on gloves! The gloves isolate the grease, and there are many fibers on the surface of the textile gloves. The contact area with the bubbles is small, so the bubbles will not be disturbed excessively, allowing them to stabilize and bounce up.
Do you believe it? Without seeing or hearing, people really can't tell the difference between Coke and Fanta . The UP owners covered their eyes, pinched their noses, drank the drink in the cup, and judged whether it was a carbonated drink. At the end of the experiment, they all described the taste of the drinks they drank as "sweet, carbonated drinks" and "sweet, sour drinks", unable to name the specific names.
Fan Zhen explained that usually we think that smell and taste are separate, but in fact, the smells and tastes they smell will converge into the leading area of the brain and only send out one signal. When we pinch our nose, more than half of our taste perception ability is also removed.
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Eat clearly and scientifically.
Before you know it, it’s midnight snack time. The “physical food stall” on the cloud has officially opened. Not only can you taste the “ golden eggs ”, but you can also open coconuts “with bare hands” and “explode” everything in the air... ...
Whether you can eat this first dish depends on how the UP owners use chewing gum to open the coconut. I saw Li Xueyuan, an associate researcher at the Institute of Physics of the Chinese Academy of Sciences, making a pointed cone of chewing gum and placing it on the table. Then he quickly smashed the coconut onto the tip of the chewing gum. It seemed that he was hitting the stone with an egg, but the coconut was knocked open. hole, coconut juice flows out instantly.
"We always think that chewing gum is soft, which is a prejudice to a certain extent." Li Xueyuan said that chewing gum is a typical shear-thickening fluid. The greater the shear dynamic force it is subjected to, the harder it becomes. In life, many valuable applications can be realized by utilizing this magical characteristic of "strengthening when strong". liquid body armor is one of them.
After tasting the fresh coconut milk, I served "air fried French fries". " air fryer essentially uses air to replace the hot oil in the original frying pan, allowing the air to circulate. In the process, the air stirs and frequently contacts the surface of the food. The hot air blows away the moisture on the surface of the food, making the food almost oily. Explosive effect," Li Xueyuan said.
If you find French fries boring, try some protein. I saw Li Xueyuan stuffing the eggs horizontally into the middle of the plastic bag and fixing it with tape. She held both ends of the plastic bag with both hands and kept shaking it. There is a tightening action in this process, which must be rapid, so as to produce a larger rotation speed and make the yolk move away from the center. In this way, can mix the egg white and the egg yolk. After slow cooking over low heat, the delicious "golden egg" is born.
Wake up, "Yunyou" is over here, are you still not satisfied? Pay tribute to these scientists who are not willing to be limited by the limitations of the laboratory. They turn science popularization into an interesting thing.
Source: Popular Science Times
Author: Epic
Picture source: Live broadcast screenshot
Editor: Mao Mengnan
Review: Wang Fei
Final review: Chen Lei
