Physicists have reproduced the chirping effect at the Kukulcan Pyramid

Colombian physicists have reproduced the unusual acoustic effect observed at the Temple of Kukulcan, located on the Yucatan Peninsula in Mexico. The echo of hand clapping at the base of the pyramid resembles the chirping or chirping of a bird. Simulations showed that this effect occurs due to the addition of many waves reflected from… Continue reading Physicists have reproduced the chirping effect at the Kukulcan Pyramid

A burial of a woman from the Koban culture with a bronze mirror was found in the Stavropol region

Archaeologists have discovered the grave of a woman 20–25 years old in the north-west of the Stavropol Territory. The accompanying grave goods and funeral rites made it possible to attribute this find to the Western Koban culture and date it to the second half of the 8th century BC. Among the artifacts found, scientists identified… Continue reading A burial of a woman from the Koban culture with a bronze mirror was found in the Stavropol region

Supernova 1181 fits the model of the merger of two white dwarfs

Astronomers from six countries have confirmed the idea that supernova SN 1181 AD, which exploded in 1181, represents the second remnant of a rare type of Iax supernova confirmed in the Milky Way. It is assumed that two carbon-oxygen white dwarfs or a massive carbon-oxygen dwarf with a helium companion merged without the resulting white… Continue reading Supernova 1181 fits the model of the merger of two white dwarfs

The return of bison has made the prairie vegetation more diverse

The reintroduction of bison to areas of the prairie where they once lived but were exterminated by humans has a positive effect on the local flora, American ecologists have found. After analyzing the results of an experiment lasting about thirty years, they found that in the presence of bison, the species diversity of prairie plants… Continue reading The return of bison has made the prairie vegetation more diverse

Evolution forced mammals to recreate salivary proteins fifteen times

American bioinformaticians have discovered traces in the genomes of mammals of 15 independent occurrences of new proteins responsible for the viscosity of saliva. According to the findings of the authors of a study published in Science Advancesthe culprit is a region of the genome with a high mutation rate and selection pressure during the evolutionary… Continue reading Evolution forced mammals to recreate salivary proteins fifteen times

The CHEOPS telescope confirmed the discovery of two exoplanets near the “Valley of Sub-Neptunes”

Astronomers using ground-based telescopes and the CHEOPS space telescope have confirmed the discovery of two exoplanets around an orange dwarf close to the Sun. One of the planets is a super-Earth and falls in the poorly explained “sub-Neptune valley”, and the second was classified as a sub-Neptune and is located near the “valley”. A preprint… Continue reading The CHEOPS telescope confirmed the discovery of two exoplanets near the “Valley of Sub-Neptunes”

Astronomers have found a record-breaking planetary nebula

Astronomers using ground-based telescopes have confirmed the discovery of a new planetary nebula in the Milky Way, which is the remnant of a star 2.8 times more massive than the Sun. The kinematic age of the nebula turned out to be record-breaking and amounted to 78 thousand years; it is part of an open star… Continue reading Astronomers have found a record-breaking planetary nebula

The water level in the Nile allowed the Egyptians to transport stone to the site of the pyramids.

At the time of the construction of the Giza pyramids, the water level in the Nile allowed the filling of an artificial reservoir near the construction site so that the Egyptians could transport materials from the quarries directly to the construction site. This was confirmed by scientists from Egypt, China and France, who examined sediment… Continue reading The water level in the Nile allowed the Egyptians to transport stone to the site of the pyramids.

Thousand-year-old remains of a man with XXY chromosomes discovered in Portugal

The remains of a man who lived more than a thousand years ago were discovered in Portugal. This adult was found to have a very wide ilium, malocclusion, and maxillary prognathism. Genetic analysis showed that the man had Klinefelter syndrome – he belonged to the karyotype 47, XXY. This was reported in an article published… Continue reading Thousand-year-old remains of a man with XXY chromosomes discovered in Portugal

DNA dating back 30,000 to 70,000 years was found in a Levantine cave.

Paleogeneticists read DNA from Pleistocene sediment samples recovered from Israel's Sephunima Cave. In layers ranging from 30 to 70 thousand years old, they were able to find fragments of mitochondrial DNA from representatives of the deer and hyena families. These are the oldest examples for deposits originating from a region with a climate similar to… Continue reading DNA dating back 30,000 to 70,000 years was found in a Levantine cave.