From what distance does a salmon catch the smell of its native river? Detailed answer

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From what distance does a salmon catch the smell of its native river? Detailed answer

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From what distance does a salmon catch the smell of its native river?

Thanks to developed exterochemoreceptors (sensitive cells on the surface of the body, through which the body perceives chemicals essential for life), salmon is able to capture the smell of its native river from a distance of up to 800 kilometers from its mouth.

In this respect, she is by no means unique. Thus, an eel senses the presence of phenylethyl alcohol at a concentration of one trillionth of a gram per cubic meter (for clarity, imagine one gram dissolved in Lake Ladoga).

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What is a pineapple?

If you look at a pineapple, you might think that you see one fruit in front of you. In fact, a pineapple is a group of fruits, closely pressed to each other. Each of these small fruits resembles a small apple. In the middle of the pineapple is the stem to which all the individual fruits are attached. The whole pineapple resembles a large pine cone in appearance. The Spaniards discovered pineapples during their travels in South America and brought them to Europe.

For many years, Europeans diligently cultivated pineapples in private greenhouses, and this fruit was considered a great luxury. As shipping developed, it became possible to bring pineapples grown in the tropics and deliver them to markets in the countries of the North, and pineapples grown in greenhouses became a rarity.

Currently, pineapples grow in many places, including the West Indies, Florida, North Africa, Hawaii, the Azores and Australia. The pineapple tree reaches about one meter in height and bears fruit at any time of the year. When the plant reaches maturity, new shoots develop below to bring in a new crop. One plant can live and bear fruit for many years. Pineapple leaves contain fibers from which fabric is made.

Pineapples are rarely grown from seed; they are usually propagated using shoots that are planted in dry ground. Sandy soil is best. Sometimes canopies are arranged over plants to protect them from possible frosts or excessive heat.

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Physicists at the University of Zurich have discovered a material that belongs to a new class of higher-order topological insulators. The faces of crystalline solids made of these materials conduct electrical current with almost no resistance, while the rest of the material remains an insulator. Such unique properties of new materials can be very useful for creating new types of electronic devices and, of course, for creating quantum computing systems.

Topology, a science that is part of materials science, deals with the study of the properties of solid particles and bodies protected from deformations and the effects of various external factors. One of the directions of this science is the study of topological insulators, crystalline materials that conduct electric current only in the surface layer. At the same time, due to some physical effects, conductive surfaces cannot be transferred to an insulating state.

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