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Which butterfly caterpillars are forced to hibernate for up to 13 winters before turning into a pupa? Detailed answer

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Which butterfly caterpillars are forced to hibernate for up to 13 winters before turning into a chrysalis?

The caterpillars of many butterflies living in the northern latitudes do not have time to turn into a chrysalis in one summer, which is why they are forced to hibernate until the next summer. Gynaephora groenlandica, found in Greenland and Canada, from the family of volnyanka, is a record holder in this respect - the life cycle of a caterpillar can last up to 14 years. Another unique ability of these caterpillars is the ability to withstand temperatures down to -70 °C during wintering.

Authors: Jimmy Wales, Larry Sanger

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Why did the powerful Median king Astyages marry off his beloved daughter to an insignificant Persian king?

According to the story of Herodotus, the father of the story, magicians once predicted to the Median king Astyages (585-550 BC) that the son born to his daughter Mandana would overthrow his grandfather and conquer all of Asia. Frightened, Astyages decided to deceive fate and gave Mandana in marriage to the Persian king Cambyses, who was subject to him. Astyages was sure that the conqueror of Asia could not be born in such an insignificant people as the Persians.

Mandana gave birth to a son named Cyrus, and the magicians repeated their prediction to Astyages. Then Astyages ordered the nobleman Harpagu to secretly kill his grandson. But Harpagus did not want to personally stain his hands with the blood of a baby and entrusted this matter to the royal shepherd. The same, having learned who Cyrus was, replaced him with his stillborn son. The shepherd and his wife raised and raised Cyrus as their son.

When Cyrus was 10 years old, the boys during the game elected him king. However, one of them, the son of a noble Mede, did not want to obey the son of a shepherd. Then Cyrus ordered to whip the disobedient with a whip. For this offense, Cyrus was brought to the king, and then it turned out that he was the son of Mandana and the grandson of Astyages. The magicians reassured the king, declaring that the prediction had come true: Cyrus, they say, had already been elected to the kingdom, and there was nothing more to fear from him. Astyages left his grandson in the palace, but Harpaga, who did not comply with the royal order, severely punished him: he ordered his sons to be secretly killed and fed their unsuspecting father with their meat. Cyrus grew up and after the death of his father in 558 took the Persian throne.

The Persians could hardly endure the yoke of the Medes, and Harpagus, thirsting for revenge, persuaded Cyrus to raise an uprising against Astyages. The uprising began in 553, and ended in 550 with the complete victory of Cyrus over his grandfather and the conquest of Media. Then in 547-546 the Persians conquered Lydia. A mighty and warlike Persian state arose. Babylonia, Egypt, the islands of the Aegean, Thrace, Macedonia and the northwestern part of India were to become the next victims of its expansion.

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Stable atoms of pion helium obtained 27.05.2020

After almost eight years of research, a group of scientists from the Max Planck Institute for Quantum Optics, Germany, for the first time managed to obtain stable and long-lived atoms of exotic matter, the so-called "pionic" helium, a helium atom in which one of the electrons was replaced by a subatomic particle - a pion in a certain quantum state. In this form, the pion can exist a thousand times longer than it exists in other types of matter, and this gives scientists the opportunity to more closely study this particle, which plays an important role in ensuring the stability and decay of atomic nuclei, using the method of high-precision laser spectroscopy.

Pions belong to a family of particles called mesons. It is mesons that are responsible for the emergence of strong interactions between the "standard blocks" of atomic nuclei, neutrons and protons. Protons with the same electric charge repel each other under normal conditions, and only the forces of strong nuclear interactions are able to bind and keep them within the atomic nucleus. Mesons, which consist of two quarks, differ significantly in structure from protons and neutrons, which consist of three quarks.

The possibility of the existence of exotic "pionic" helium atoms was theoretically predicted as early as 1964, but until recently none of the scientists has been able to obtain such atoms experimentally. And now, thanks to the work of German researchers, scientists around the world have a completely new area for further research.

For eight years, German scientists have been trying to find evidence for the existence of "pion" helium atoms. To do this, they used a tank filled with cooled helium in a liquid superfluid state. The main difficulty that led to the long duration of the experiments was to find the wavelength of laser light at which the "kicked" pion knocks out an electron from an excited helium atom and takes its place. Naturally, such atoms exist for some time and decay, and it is these "fragments" of atoms that became proof of the existence of exotic atoms of "pion" helium.

Theoretical scientists, despite a lot of research in this direction, have not been able to calculate the wavelength of light, under the influence of which helium atoms will go into one of the stable excited states, and the pion will make a "quantum jump" of a certain type, replacing the electron. So scientists used three complex laser systems one after the other until they found the right wavelength by simple enumeration.

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