Why are there so many angry face crabs off the coast of Japan? Detailed answer

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Why are there so many angry face crabs off the coast of Japan? Detailed answer

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Why are there so many angry face crabs off the coast of Japan?

Off the coast of Japan, heikegani crabs live, the pattern on the shell of which resembles the face of an angry samurai. According to the popularizer of science Carl Sagan, this species owes its appearance to unintentional artificial selection. Many generations of Japanese fishermen, catching such crabs, released them back into the sea, as they considered them to be reincarnations of samurai who died in battle. By doing this, fishermen increased the chances of heikegani to reproduce and increase their number among other crabs.

Authors: Jimmy Wales, Larry Sanger

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What is the principle of thermal insulation?

Thermal insulation reduces the transfer of heat from one object to another, from one place to another. For example, thermal insulation helps keep houses warm in winter. In summer, on the contrary, it contributes to the establishment of coolness in buildings, not letting the heat in from the street.

Thermal insulation prevents heat loss from hot pipes and tanks, and does not let heat into refrigerators and cold warehouses. It is used in refrigerated vehicles. In this case, materials are used that conduct heat poorly. These materials are filled with very small particles of air or gas, which are good insulators.

Different materials conduct heat differently. Some pass it very well, others slow down heat transfer. For example, silver is a good heat conductor. It transmits heat 19 times better than air.

One of the best and most common thermal insulation materials is fiberglass. Drops of a certain kind of molten glass are placed in a spinning wheel. It pulls the droplets into fibers, cooling them in the air stream. Fiberglass prevents heat loss 44 times better than glass, 7 times better than wood and 4 times better than asbestos.

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