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Mechnikov was wrong

20.07.2012

At the end of the XNUMXth century, the outstanding biologist I. I. Mechnikov suggested that putrefactive bacteria living in the large intestine are to blame for human aging (at that time they did not know that these bacteria produce the vitamins we need). To prolong life, Mechnikov suggested drinking yogurt to replace harmful bacteria with beneficial lactic acid.

However, recent studies at St. Louis University (USA) showed that eating yogurt twice a day for four months does not change the intestinal microflora, but only improves its ability to absorb complex carbohydrates from vegetables and fruits. And this effect does not last long.

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Kitchen salt asteroid 14.06.2023

The Americans carefully studied a sample of the near-Earth asteroid Itokawa and found crystals of ordinary kitchen salt here, which could not have appeared without the presence of water.

Even 13 years ago, the Japanese spacecraft Hayabusa delivered the first ever rock samples from an asteroid to Earth. This space rock turned out to be the near-Earth asteroid Itokawa, which is approximately 610 meters wide. And all these years, scientists from different countries continue to carefully study these samples. Specialists from the University of Arizona, USA, found crystals of ordinary kitchen salt in the composition of the asteroid, which could not have appeared if there was no water nearby. This again changes the idea of how water could get to our planet.

Scientists continue to search for answers to questions about how complex life on Earth arose. The fact that they were able to find crystals of sodium chloride or ordinary kitchen salt in the composition of the Itokawa asteroid, which could only form in the presence of water, indicates that asteroids played an important role both in the process of its appearance on Earth and in the origin of life.

Currently, scientists believe that the asteroid Itokawa, which flies relatively close to Earth (at a distance of several million kilometers from us), was part of a larger space rock, but then broke away from it. And the rock sample brought from the asteroid is a chondrite, which is a type of meteorite that is part of a rocky asteroid.

According to American scientists, they did not expect to find crystals of sodium chloride, since such asteroids do not suggest the presence of water-bearing minerals.

The authors of the study point out that for a long time it was believed that chondrites, that is, meteorites falling to Earth from rocky asteroids, could not bring water to the planet. But a new discovery suggests that such asteroids likely contain much more water than previously thought.

Naturally, the experts were very surprised by their discovery and were initially skeptical about the results. After all, a sample from the Itokawa asteroid could have been contaminated with other substances, falling to Earth. But a careful study showed that the crystals of ordinary salt belong to the asteroid Itokawa.

The sodium-rich silicate mineral plagioclase was also found in the meteorite. And this mineral was also formed under the influence of water. Therefore, the researchers believe that this proves the fact that the asteroid Itokawa probably contains or contained a lot of water in the past.

The Itokawa asteroid is one of the most common S-type asteroids in the solar system. Therefore, it is assumed that the theory of the origin of water with the help of asteroids that fell to the Earth or meteorites that broke away from them is becoming more and more plausible.

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