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North Korea has developed a vaccine against coronavirus and has already begun clinical trials. About it reports RIA Novosti with reference to the portal about the scientific achievements of North Korea.

It is reported that a vaccine refers to the type of recombinant subunit, that is, aimed only to cause the body’s immune response. The advantage of these drugs is their safety. Lack of vaccines of this type is that they require regular vaccinations, since they have very low immunogenicity, the fact is that they are disposable.

Clinical trials of the drug began in July, the vaccine has shown its effectiveness and safety on animals, however scientists are faced with the complexities of human trials because the country has not registered any SARS CoV infected-2.

Earlier it was reported that registration of a Russian vaccine against the coronavirus is expected in August. Phase II trials of the Russian vaccine, developed by the Institute Gamalei, will end on 3 August, the third will take place including abroad. Production, probably deployed in Saudi Arabia.

Scientists have discovered a rare black hole high-mass (IMBH), remote from Earth 10 million light-years. The discovery of this exotic object will help to reveal the formation mechanisms of supermassive black holes, which still remain unknown. This was reported in an article published in the journal Monthly Notices of the Royal Astronomical Society.

The unusual black hole is in a galaxy Mirage’s Ghost (NGC 404), so named because of the weak light and near visible location on the celestial sphere to the star Worlds. The mass of an object 550 thousand times the mass of the Sun. IMBH occupy an intermediate position between black holes of stellar mass (up to one hundred solar masses) and supermassive black holes, or SMBH (from a million to a billion solar masses). A normal black hole formed by collapse of large stars, however, if the star mass is too large (130-250 solar masses), it ends their life in the form of a pair-instability supernova, which does not leave any residual of the object.

According to one model rather large black holes are formed by the absorption of a large number of substances, but the problem is that the IMBH is quite rare. According to another scenario, supermassive black holes arise from the direct collapse of dense interstellar clouds in the galactic nuclei. It also indicates that SMBH are found in the early Universe after the Big Bang, not enough time has passed that the black hole has time to grow to enormous size.

Researchers have discovered a black hole in Ghost Mirage, watching the movement of the gas around its nucleus through a set of radio telescopes ALMA (Atacama Large Millimeter Array) in Chile. The simulation results showed that the picture corresponds to the presence of a black hole the average weight. According to the findings of scientists, its existence is supported both models of SMBH evolution. She has a mass in the range predicted by models direct collapse, but it actively absorbs interstellar gas.

Scientists at Bournemouth University in England found that the Hyksos, who ruled Egypt in the seventeenth century BC, in fact, were not foreign invaders, and a group that came to power from within the state. Paper, revealing the secret of an ancient people, published in the journal PLoS ONE.

The Hyksos ruled in Egypt from 1638 to 1530 BC, during the XIII-XVII dynasties of the pharaohs. According to historians, they came from the Middle East, but it was unclear how they seized power. According to one version, they invaded Egypt, but this idea was questioned.

The researchers analyzed samples of tooth enamel belonging to 75 people buried in the ancient capital of the Hyksos tell El-Daba in the North-Eastern part of the Nile Delta. They compared the ratio of strontium isotopes in the remains with the ratio of isotopes in Egypt and other places. It turned out that many residents were not local, immigrated from different countries, which emphasizes the multicultural origins of the Hyksos. Over time immigrants have come to power without resorting to violence.

Scientists at the University of Washington and Institute performance and health evaluation (IHME) in the US predicted that by the end of the century the number of people on Earth will start to decline, which may lead to demographic disaster. About the gloomy future of mankind reported in the journal Lancet.

Researchers estimate, in 2060 the number of people on the planet will increase by two billion people. However, in a few decades the birth rate will fall, and countries such as Italy and Japan, will lose up to half of its population. Although this is potentially better for the environment, the increasing proportion of elderly people and the decreasing share of young will create economic problems, as well as strike the health and social support.

To 2064 year the number of people will reach 9.7 billion people and by 2100 will be reduced to 8.8 billion. This is contrary to previous estimates, according to which the end of the century the population will increase to 12.3 billion people and will not shrink. However, in the new work the researchers used an improved model based on cohort fertility — the average number of children born by a group of women of a certain age (in this case, up to 50 years).

According to the results of the model significantly drops the birth rate in Africa. For example in the countries South of the Sahara, one woman has, an average of 4.7 newborns. In particular, in Nigeria in 2017 this figure reached a record seven births per woman. By 2100, it will fall to 1.8. Japan’s population will fall from 128 million to 60 million, and in China will fall below one billion.

The number of people over 80 years will increase approximately six times. This will require additional resources to support the level of health. One way to cope with the crisis for some countries can be a proper immigration policy and support for large families. At the same time restricting access to reproductive health can result in devastating consequences, write the authors.