WHY do muscles increase in volume after working out?

During a muscle workout, the muscle fibers are torn and the outer cell membranes are destroyed, causing the release of signaling substances.

After that, muscle tissues actively divide and their number, size increases. The muscle becomes bulkier💪🏼

WHY are the pills made in different colors?

The pills, in addition to their direct effect, impact the patient psychologically.

Scientists have proven that the psychological effect is stronger for pills with "beautiful" colors.

📌 Besides, the coloring helps to distinguish the pills. Of course, all dyes have to be tested for safety.

WHY do restaurants give mint gum to customers?

The staff is not trying to hint at customers' stale breath in this way, as it may seem at first 😄

The idea is to take care of digestion. Peppermint soothes the smooth muscles of the gastrointestinal tract. Products containing mint can eliminate heartburn, feelings of bloating and overeating.

The restaurant is interested in making you feel great after your meal.

WHY are the auroras multicolored?

During collisions, atmospheric atoms can lose electrons (ionize) or turn into an excited state for a short time. Photons with different wavelengths are emitted, which is what the human eye or camera sees.

Oxygen is responsible for the green or brownish-red color, as well as the greenish-yellow polar lights. Other constituents of the atmosphere also make small contributions, such as hydrogen and helium giving blue and purple colors.

WHY does chocolate make you feel good?

The fact that chocolate contains a substance called the hormone of happiness, tryptophan. It significantly boosts your mood.

📌Even when treating depression, doctors advise eating more chocolate.

WHY does audibility improve after it rains?

During and after rain, sound travels best due to little dust and other particles in the atmosphere that absorb and weaken sound waves.

Yet, during fog, when the atmosphere is full with water, audibility gets worse.

WHY do we put out fire with water?

Water, sand, foam, and anything else that puts out a fire cuts off the oxygen to it.

The substances thus cover the burning area and stop the chemical process. Besides, water has a high heat capacity and heat of evaporation. It cools the burning material and slows down the release of combustible gases.

WHY is the temperature on the thermometer set at 42° C?

Have you ever boiled an egg? After a few minutes of boiling, the protein curdles, becomes dense and white; this process is called denaturation.

📌 At 42°C, the body also starts denaturing (clotting) blood proteins.

Furthermore, at this temperature, metabolic disorders begin in the brain. Such a condition is already incompatible with life, i.e. fatal.

WHY don't birds fall when sleeping on a branch?

Humans can fall asleep when their muscles are as relaxed as possible. In birds, it's the other way around.

❗For them, sleep is only possible when they tense the leg muscles that help them sit steadily on the branch.

These muscles are connected to the fingers by long tendons. When a bird sits down, the muscles contract, the tendons tighten, and the fingers clench. During sleep, the bird cannot straighten its legs, so the toes do not release their support.

WHY do sharks never sleep?

Some species have to swim all the time, otherwise water stops flowing through their gills so they cannot breathe.

Others rest during special periods, but do not fall into an unconscious state.

❗Normally, a shark can rest, remaining in place, for no more than an hour. If it fell asleep for a long time, it would die from lack of oxygen.

WHY do llamas spit at people?

📌 According to Successful Farming research, these animals can spit up to 3 meters long😱

They do this most often in a group to establish hierarchy or to tell an unwanted guest to leave.

If a llama spits at a person in the zoo, it means that he annoys it or intrudes on its territory.

So it is better not to stand next to this cute creature at the zoo😌

WHY don't your eyes freeze in winter?

Our body has a unique thermoregulatory system. When the ambient temperature drops, the blood flow to the eyeballs increases, 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 cold temperatures.

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 flavors.

The foaming agent also destroys phospholipids, which normally reduce the sensation of bitterness.

WHY are cats afraid of water?

Pets are descendants of the wild Nubian cat, which inhabits 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.

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.

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.

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.

WHY are Chinese inmates forced to play computer games?

Virtual currency is earned by so-called "gold-farmers", who have such games as a regular daily job. The vast majority of them are employed in China, with more than 100,000 total in 2005.

So in many Chinese prisons, bosses and guards force inmates to play online games for illicit profit.

WHY does Louis Vuitton burn unsold bags?

Louis Vuitton makes some of the most expensive handbags in the world. Remarkably, they never put their goods on sale.

In order to maintain their status as an expensive brand, the company burns all unsold bags so that no one can buy them at a discounted price.

📌 According to statistics, Louis Vuitton is the most counterfeited brand in the world.

WHY don't ducks get wet or freeze in winter?

A duck applies and distributes a special fatty grease, which is secreted by the coccygeal gland, all over its body. It keeps them dry.

As for the extra warm fur and subcutaneous fat, it keeps the cold from penetrating the duck's body. That's why ducks are warm in any frost and can take off even after long "water procedures" as their feathers stay dry.

WHY haven't humans tamed zebras?

As early as the 19th century, colonizers thought of domesticating zebras in Africa to avoid transporting horses to the continent. Zebras are also resistant to diseases carried by the tsetse fly.

Yet unlike horses, which are carefree, zebras are in a constant state of stress, running away and even sometimes fighting savannah predators. Cornered, a zebra can beat a lion to death.