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How much does a clam shell weigh? Detailed answer

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How much does a clam shell weigh?

Tridacna is a genus of large bivalve mollusks that live in the coastal zone of tropical seas.

The most famous common in the Pacific Ocean is the giant tridacna (Tridacna gigas). The weight of this sea monster reaches 250 kilograms (even 430-kg specimens are found), and the length of the shell is 1,4 meters.

The inhabitants of the islands of Oceania use the shells of tridacna as a building material and for the manufacture of household utensils, jewelry, amulets, and also as money for local trade.

Author: Kondrashov A.P.

 Random interesting fact from the Great Encyclopedia:

Why was Socrates sentenced to death?

Socrates (470-399 BC), one of the greatest ancient Greek philosophers, who became for subsequent generations the embodiment of the ideal of the sage, was sentenced to death by the Athenian authorities and took hemlock poison.

It all started with the fact that Melitus, who was known as a poet in Athens, accused Socrates of allegedly breaking the law, trying to explore what is under the earth and what is in heaven, "passing off lies for truth and teaching the same to others." Socrates was accused of violating piety, and of denying the gods recognized by the Athenians and introducing new ones, and even of accepting demonic signs. This was said publicly.

The hidden motive of the accusations was different: Socrates' clever, sharp and ironic statements undermined the Athenian slave-owning democracy. This proves the course of voting in court. When the judges first decided on the guilt of Socrates, only a small number of votes were cast against him. However, the second speech of Socrates - on the measure of punishment, full of mockery of the traditions of the Athenians and not expressing remorse - led the judges into indignation. Socrates was sentenced to death by an overwhelming majority.

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In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

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bio-cement 18.03.2023

Bioengineers from the Technical University of Denmark have figured out how to reduce carbon emissions in the construction industry. Genetically modified bacteria capture carbon dioxide and use it to create calcium carbonate, one of the main elements of cement.

For their production, the researchers used the genes of coral polyps. These animals build "huge buildings" under water - coral reefs - calcareous structures that resemble cement in composition. Bioengineers have transferred genes from these living organisms to bacteria. The modified microorganisms produce an enzyme that binds carbon dioxide to calcium carbonate (limestone).

High temperatures when cement is heated during the manufacturing process lead to the release of carbon dioxide. In 2021 alone, according to the authors of the study, about 2,9 billion tons of carbon dioxide were emitted into the atmosphere during the production of this building material. This is about 7% of the total emissions.

The main idea of ​​the new technology is to create a closed cycle production. Engineers propose using a bioreactor that will capture carbon dioxide released when heated and turn it into limestone. The finished material can be reused for cement production.

At present, the researchers have only tested their technology in the lab. To scale up production, it will be necessary to increase the resistance of bacteria for industrial applications and modify the production of cement. The technology has special requirements for a bioreactor, the bioengineers explain. Modified bacteria, like corals, work in a liquid environment, while the finished material is solid. Therefore, when designing a reactor, it is necessary to create a method for easily transporting finished calcium carbonate from the bioreactor.

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