Extra Education

Q. Why can't we detect our own body odor? There are areas of the cerebral cortex responsible for recognizing odors . Information is carried to it by nerves from receptors. Since our body continuously emits scents, the receptors quickly become accustomed to them. As a result of this malfunction, the nervous system ignores the information it receives. But once the smell changes, the nerve endings send a signal to the brain and we perceive a new scent. ------ Last Updated : Nov 18, 2021

Why are there more right-handers than left-handers? The motor functions of the right side of the body are controlled by the left hemisphere of the brain, which is responsible for logic and consistency of thought. Namely these qualities were the guarantee of survival in ancient times. In general, the most intelligent and rational people with dominating left hemisphere continued to live. And they also enshrined in human DNA a code: left hemisphere is prevailing, right hand is leading. ----- Last Updated: Nov 16, 2021

Why don't insects die after falling from a great height? If we compare the weight of an ant and a human, the difference is several thousand times. As an example, the free-fall speed of a human is about 50 m/s. And the fall speed of an insect is around 1 m/s. The lower the fall speed, the less damage will be caused. Also, many insects have wings. ----- Last Updated : Nov 16, 2021

Why is it easier to swim in salt water than in fresh one? Salt is what makes water heavier. And the greater the density (weight) of water, the easier it is to float in. An object can float in a liquid if its weight is equal to the weight of the water it pushes out (the water is displaced to give room to the object). You can also look at it from another angle: if you sit in a tub of water, the water level in it rises. If you drain the water that your body has displaced, the weight of it will be equal to the weight of your body. ------ Last Updated : Nov 16, 2021

Why is there 12 months in a year? Cause there are 12 months in the year. People used to count time using recurring natural phenomena. A year is the time from one  flood to the other. Conversely, a month is the period from new moon to new moon, which is about 29.5 solar days. About 12 such intervals fit into a year, so 12 months were counted annually. ----- Last Updated : Nov 16, 2021

Why are cats afraid of water? Pets are descendants of the wild Nubian cat, which inhibits Northeast Africa, where there are no large bodies of water. Water is an unfamiliar and potentially dangerous environment for domestic cats; they cannot swim and instinctively avoid getting into water. ------ Last Updated : 16 Nov 2021

Q. Why shouldn't people throw batteries away? Once battery, no matter how big or small, which ends up in the environment contaminates about 20 square meters of land or 400 liters of water with heavy metals! Not only the flora and fauna of our planet, but also human beings suffer from such pollution. Not only the flora and fauna of our planet, but also human suffers from such pollution. Therefore, don't expose yourself to danger and recycle batteries! ------ Last Updated: 15 Nov, 2021

Why does food seem disgusting after brushing teeth? Sodium lauryl sulfate is a foaming agent that is added to almost all toothpaste. It weakens the taste buds responsible for perceiving sweet flavor. The foaming agent also destroys phospholipids, which normally reduce the sensation of bitterness. ------ Last Updated: 15 Nov, 2021

Why don't wolves perform in circuses? Wolves only feel comfortable and safe when they are in a pack. A wolf pack is a highly socialized group, where each animal has its own social role . A solitary animal does not survive in the wild, it is chased out of all places, so the wolf's life depends on the pack. And it is impossible to train a pack of wolves in a circus. ----- Last Updated : Nov 08, 2021

Why don't your eyes freeze in winter? Our body has a unique thermoregularity system . When the ambient temperature drops, the blood flow to the eyeballs increase , bringing them additional heat, which prevents them from turning into ice. The fluid that moisturizes the eyes contains salts. The salt water keeps your eyes from freezing even in extremely keeps your eyes from freezing even in extremely cold temperatures. ----- Last Updated : Nov 08, 2021