Which animals can change houses in a chain? Detailed answer

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Which animals can change houses in a chain? Detailed answer

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Which animals can change houses in a chain?

When a hermit crab grows out of its shell and goes in search of a new home, a situation may arise when its relatives move along the chain. Other hermit crabs inspect the abandoned shell, and if they find it too big, they wait. Moreover, as new candidates arrive, a queue is formed, ordered by the size of individuals. When a crayfish finds the first shell suitable, it leaves its largest crayfish behind and starts a chain of movements.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Do all cats purr?

When something smells delicious or you just feel good, you sometimes hum rather: "Mmmm! .." When the cat wants to express its pleasure, it purrs. The purring sound is produced by the vibration of the vocal cords. The cat draws air into the lungs, and it passes through the vocal cords along the way.

Thus, if desired, the cat can allow the vocal cords to vibrate with air pressure. When a cat doesn't want to purr, she doesn't use her vocal cords - and no purring! Of course, when we talk about a cat, we usually mean a domestic cat. But there are still many members in the cat family. Did you know that the tiger, lion, leopard, jaguar, coguar, ocelot, and lynx also belong to the cat family? As for the reproduction of various sounds, a domestic cat, in addition to purring, can also meow, howl and yell.

Other types of cats make different sounds. Lion and tiger can roar. Jaguar and leopard make a sound similar to a loud cough or bark. But the most interesting thing is that due to the different structure of some of the bones of the throat, neither a lion, nor a tiger, nor a jaguar, nor a leopard can meow! But all cats, regardless of their size, have the same body proportions. If you enlarge the photo of a cat to a large format, you will see that it is very similar to a tiger.

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The meaning of life helps to sleep peacefully 26.07.2017

Many elderly, and not only elderly people, sometimes have problems with sleep: at night a person often wakes up, sleeps poorly, and in the morning he cannot shake off his drowsiness.

Usually, in such cases, some medications or physiological procedures are prescribed, but the doctors themselves do not hide the fact that it is better, if possible, to manage with purely psychological means. One of the psychological ways to make sure that you sleep well, scientists at Northwestern University found out: for good sleep, our lives must have meaning.

Researchers surveyed more than eight hundred people aged 60 to 100 about how they sleep and whether their lives feel meaningful. The "sleepy" questionnaire included thirty-two questions, the "for life" questionnaire - ten, and among them was, for example, this: a person was asked to rate how much the following statement applies to him - "I like to think about what I did in past and what I'm going to do in the future."

It turned out that those who are satisfied with their own lives, who know why they live, sleep better. They, say, are 63% less likely to suffer from sleep apnea - this is the name for short-term respiratory arrests, due to which sleep is disturbed and, as a result, daytime sleepiness, fatigue appear, memory and intelligence worsen, and working capacity decreases. Also, those who live “with meaning” are 52% less likely to have restless legs syndrome, when, due to discomfort in the legs, a person is forced to constantly move them, which again, like apnea, disrupts sleep - and further down the list.

Only older people took part in the experiment - among them were both women and men, both white and black, while none of them suffered from age-related dementia. But it seems that a similar pattern can be found among younger people - although, of course, young people rarely think about the meaning of their lives.

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