13 "eternal" questions and answers to them

Many of us often ask dozens of the same questions. For example: What is the resolution of the human eye? Where is the center of the universe? What appeared first: an egg or a chicken? We invite you to find out the answers to the age-old questions and get acquainted with the scientific facts that remained uncovered during the period of study at school.

• 13. What color is the mirror?

  Answer: Green.

  Explanation: The human eye can distinguish about 10 million different colors, but it's hard to believe that the mirror is not "white" or "silver". In general, an ideal mirror should be "white" because it should reflect the sun's rays ideally. But since the ideal world does not exist, there is no ideal mirror either. A real mirror does not reflect as much light, and it is displayed in the 510 nanometer range. This corresponds to the green light spectrum.

• 12. What percentage of the brain do we use?

  Answer-Explanation: Albert Einstein claimed that we humans use no more than 10% of our brain capacity. This myth began in the 1890s and the beginning of it was put by psychologist William James. He noticed that not all areas of our brain maintain constant electrical activity.

  But in James' time, no one knew that different parts of the brain were used for different functions. Now that we know this, it becomes obvious that when performing different tasks, we use different parts of the brain, and to the fullest.

  From 1% to 16% of brain cells are responsible for conscious processes at different points in time. But most cells govern unconscious processes: breathing and heart rate, coordination in space, and so on.

  The human brain consumes 20% of the body's energy, and in children this figure reaches 50-60%. Therefore, it is foolish to assume that we still have some hidden reserves.

• 11. Where do the files deleted from the PC go?

  Answer: Nowhere, they are still there.

  Explanation: The files we "delete" on a computer are not physically gone. They continue to be stored on the hard disk, although the operating system does not see them. In fact, in order to erase data from a hard drive, you need to overwrite it. Or use special utilities that delete files with ends.

  Well, if special agents are chasing you, then you better not just throw away the hard drive, but destroy it.

• 10. What is the resolution of the human eye?

  Answer: 576 megapixels.

  Explanation: The human eye really works like a digital camera. And it, indeed, has a huge resolution. With good light and healthy eyes, a person is able to distinguish two lines that are at an angle of 0.6 degrees to each other.

• 9. Sunlight - does it weigh anything?

  Answer: Yes

  Explanation: Sunlight is made up of photons that travel from the Sun to the Earth. The mass of the total light falling on the Earth is 3.7 * 10 to the 24th power of kg. On a sunny day, the city of Chicago weighs 140 kg more than on an overcast day - and all because of the fact that so much light falls on it.

• 8. Where is the center of the universe?

  Answer: Everywhere.

  Explanation: The universe began with the Big Bang about 13.7 billion years ago. Since then, it has been constantly expanding. The center of this matter is the whole world. No matter where you are in the universe, all objects in space will expand and move away from you at the same rate.

• 7. Which came first: the egg or the chicken?

  Answer: Egg.

  Explanation: Animals reproduced with eggs long before the appearance of chickens as a species. When two animals of the same species mate, they pass on genes in the form of DNA to their offspring. But this copying is never 100% accurate. Therefore, the organisms of each new generation are different from the previous one. These tiny changes in DNA over thousands of generations create new animal species.

• 6. What would happen if all the people on Earth jumped at the same time?

  Answer: Nothing.

  Explanation: About 7 billion people live on Earth. Their total mass, according to statistics, is approximately 560 billion kg. But the mass of the Earth is incommensurably greater: 5.9 * 10 in the 24th degree kg. So the planet will not notice absolutely anything.

• 5. Can guns be fired in space?

  Answer: Yes.

  Explanation: Guns don't need oxygen. Vacuum will not be a problem for them. Gunpowder is an autonomous thing, and it does not need air to explode. It is just that a bullet fired in space, will fly millions of light years in space until it hits some surface.

• 4. How much money is there in the world?

  Answer: 75 trillion US dollars in equivalent.

  Explanation: The share of dollar reserves in central bank holdings fell to about 59 percent, the lowest level in 25 years.

  In addition, it is worth remembering that in cash on the planet there are only 25 trillion dollars in equivalent. The rest is electronic money.

• 3. How much is the Earth worth?

  Answer: Between $4.67 and $6.85 quadrillion.

  Explanation: The formula for calculating the cost of the Earth was invented by Greg Lugman, an astrophysicist at the University of California. He took into account the age of the planet, the temperature, the mass of its surface, the mass of the living world, and a hundred other factors. Lugman is sure that the Earth is the most valuable planet in the Universe. For example, he valued Mars at just $15,000, while Venus, he said, is not worth a penny.

  By the way, History Channel specialists came to similar estimates. They calculated the cost of water resources of land, granite, timber and minerals at their current prices. It turned out 6.8 quadrillion dollars.

• 2. What if the Earth stops rotating?

  Answer: There will be nothing. Everyone will die.

  Explanation: The Earth rotates at a tremendous speed. If you are at the equator, you are moving in the universe at a speed of 465 meters per second. If for some reason our planet stops rotating around its axis, the Earth will simply burn out. Like a piece of meat on a fire, if it is not turned over.

  Plus, a giant tsunami will begin all over the planet. Half of the Earth will burn out, and the other half will freeze. The wind speed will be stronger than the shock wave from the explosion of an atomic bomb. The iron core at the center of the Earth will stop too. This will destroy our protective magnetic field. The radioactive rays of the Sun will burn out everything that remains literally in a second. The water will boil and evaporate.

• 1. Is time travel possible, at least theoretically?

  Answer: Yes, but you can “go” only to the future.

  Explanation: Theoretically, we are already traveling in time - at a rate of one hour per hour. Can we speed up or go into the past? Nothing will come of the past, but we can go to the future - but only theoretically.

  russian cosmonaut sergei krikalev has already undertaken such a journey. He spent 803 days, 8 hours and 39 minutes in Earth's orbit. All this time he was moving at a speed of 17.5 thousand miles per hour. Therefore, he experienced the effect of time dilation. I.e., in fact, for a year of travel, he began to live in the future by 0.02 seconds.

  Einstein's theory of relativity tells us that when our speed is comparable to the speed of light, time will begin to slow down for us.

  And now about the absolute theory. Imagine that you are a 10-year-old boy and you left the Earth moving away from it at 99.5% of the speed of light (which is currently impossible). If you return back to Earth in five years, then all your classmates will not be 15, but 60 years old. Because your five years of travel were the equivalent of 50 years on Earth.