Nonlinearity of quantum dot waveguide helps entangle photons

European physicists have studied in detail the interaction of single photons in a photonic crystal waveguide containing a quantum dot. They showed that by varying the duration of the pulses and their delay, it is possible to achieve varying degrees of nonlinearity, as well as control the degree of correlation of light quanta. The study… Continue reading Nonlinearity of quantum dot waveguide helps entangle photons

Wooden sickles more than 7,000 years old found in Italy

Archaeologists presented the results of a study of three wooden sickles discovered during underwater excavations at the Early Neolithic site of La Marmotta in Italy. It turned out that these tools were made more than seven thousand years ago from oak and wood belonging to the rose family. Ancient people used resin from pine trees… Continue reading Wooden sickles more than 7,000 years old found in Italy

Hormone injections improve cognitive performance in Down syndrome

Injections of a hormone from the hypothalamus, which is responsible for the development of the genital organs and is commonly used to treat infertility, have been able to improve cognitive performance in people with Down syndrome. This was discovered by European scientists who conducted a study on seven young men. After six months of living… Continue reading Hormone injections improve cognitive performance in Down syndrome

Scientists disprove stereotype of lazy cannabis users

British researchers have refuted the stereotype that people who smoke marijuana are more apathetic and unmotivated. They tested cannabis users and non-users for apathy and anhedonia, and conducted a series of reward-related behavioral tests. The results showed that there was no significant difference between the two groups. A study conducted among adults and adolescents was… Continue reading Scientists disprove stereotype of lazy cannabis users

Ancient Tarim people were found among the ancestors of modern inhabitants of the Pamirs

Geneticists investigated the origins of speakers of Turkic and Indo-European languages ​​from Central Asia, for which they sequenced the DNA of 131 people and combined the data obtained with previously published ancient and modern genomes. It turned out that the origin of the Kyrgyz can be modeled from two components: the population of Xinjiang of… Continue reading Ancient Tarim people were found among the ancestors of modern inhabitants of the Pamirs

Burial of a woman with a 1,400-year-old folding chair unearthed in Germany

Archaeologists have discovered the burial of a woman in Middle Franconia who died at approximately 40–50 years of age around 600 AD. Among her accompanying equipment was a folding iron chair. This is only the second such discovery from the early Middle Ages made in Germany. This was reported in a press release from the… Continue reading Burial of a woman with a 1,400-year-old folding chair unearthed in Germany

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

Paleogeneticists read the genome of the “warrior with a griffin” from Nestor’s palace

Paleogeneticists have studied the origins of populations whose history is known from written sources. They discovered that the Mycenaeans arose from the mixing of Minoans and migrants whose origins were connected with the Eurasian steppe. However, the famous “warrior with a griffin,” whose rich burial was found in Pylos several years ago, did not have… Continue reading Paleogeneticists read the genome of the “warrior with a griffin” from Nestor’s palace

Watering with ethyl alcohol protected the rhizome from drought

Japanese geneticists have proposed increasing the drought resistance of plants using ethanol. They watered Tal's rhizomes (Arabidopsis thaliana) with a weak alcohol solution for three days and showed that this helped the plants survive the subsequent three-week drought. In response to alcohol, the plant activates the synthesis of the stress phytohormone, abscisic acid, which helps… Continue reading Watering with ethyl alcohol protected the rhizome from drought

Analysis of 777 ancient genomes clarifies the origins of paleometal populations

Paleogeneticists analyzed 777 ancient genomes from Anatolia, southeastern Europe and western Asia, spanning the last ten thousand years of human history. Focusing on the Palaeometallic Age, scientists found that there was no gene flow from Europe to Anatolia during the entire Bronze Age. In addition, they clarified the influence of representatives of the Yamnaya culture… Continue reading Analysis of 777 ancient genomes clarifies the origins of paleometal populations