Chemists from the USA, South Korea, Hungary and Switzerland have developed a heterogeneous ruthenium-based catalyst for the synthesis of cyclic polymers from cyclopentene. They also managed to come up with a reaction installation that makes it easy to separate the catalyst from the reaction products. The study was published in Nature Chemistry. Linear polymers containing… Continue reading Heterogeneous catalyst reduces the cost of synthesis of cyclic polymers
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
Archaeologists have discovered in Norway the shaft of a medieval arrow, the broken shank of which was repaired by a hunter using sinew. However, apparently, then he was unsuccessful again and his shot missed the target, burying the arrow for several centuries under snow and ice. As the Secrets of the Ice project team reports… Continue reading In Norway, a repaired arrow from an unlucky hunter was found that had melted from under the ice.
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
Archaeologists have discovered the burial of a “vampire woman” in Poland dating back to the 17th century. An iron sickle lay across the deceased's neck, and there was a padlock on the big toe of her left foot. As reported by Arkeonews, perhaps the reason for the unusual ritual was the appearance of the deceased.… Continue reading The burial of a “vampire woman” with a sickle on her neck and a castle on her leg was found in Poland.
British climatologists studied the distribution of smoke in the stratosphere after bushfires in Australia in 2019–2020. They found that black carbon particles in the smoke increased the average temperature in the lower stratosphere by 0.7 degrees worldwide, with temperatures rising by three degrees over Australia. Additionally, the reaction of smoke and ozone has caused the… Continue reading Bushfire smoke raised temperatures in Australia by three degrees
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
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
Archaeologists explored the ancient settlement of Red October-1, located in Taman. As a result of this work, they established that the fortified settlement arose at the turn of the 6th–5th centuries BC and existed until the modern era. Among the rare artifacts discovered at this site were a gray clay lamp in the shape of… Continue reading Archaeologists have discovered a bronze figurine of Jupiter in Taman
Chemists from Germany, the USA and Denmark have found that substances secreted by human skin lead to the formation of an oxidative field around it. Scientists placed four people in a sealed mock-up office and began ozonizing the air to a level close to the maximum permissible concentrations. The experiment showed that ozone interacts with… Continue reading Ozonation of the air caused the skin to create an oxidative field around a person