Stars born from black hole seen in dwarf galaxy A supermassive black hole has been observed helping to create newborn stars in a dwarf galaxy about 34 million light-years from Earth. The stars in Henize 2-10 were seen linked to a huge gas jet coming from the black hole by the Hubble Space Telescope. Live […]
A cement is any of various substances used for bonding or setting to a hard material. A popular one, Portland cement, is a mixture of calcium silicates and aluminates made by heating limestone (CaCO3) with clay (that contains aluminosilicates) in a kiln. The product is then ground to a fine powder. When Portland cement is […]
Author: Martha R. Villabona works at Subdirección General de Cooperación Territorial e Innovación Educativa of the Spanish Ministry of Education and Vocational Training, where she coordinates the area of multiple literacies. Vaccination is one of the topics vulnerable to online disinformation. Although opposition to vaccines has existed since they became widespread in the 19th century […]
Once upon the time, or to be precise between 200 and 150 000 years ago, the incipient humanity was struggling with climatic conditions in its land of origin, Africa. A long glacial era, M2 , had made it difficult to find food. And, although to what extent the population was reduced to a few hundred […]
Fossil dating method points to earlier human emergence Humans were likely around about 36,000 years earlier than previously though. Researchers calculated the age of fossils found in Africa using the single crystal argon-argon dating method, analyzing pumice and ash left behind by ancient volcanic eruptions upon which the fossils were resting. Inverse Supernovas responsible for […]
Any person with some basic knowledge of chemistry is familiar with the concept of electrolysis, i.e., the production of a chemical reaction by passing an electric current through an electrolyte – a liquid that conducts electricity as a result of the presence of ions. It has found major applications since the early days of modern […]
“The last star will slowly cool and fade away. With its passing, the universe will become once more a void, without light or life or meaning.” So warned the physicist Brian Cox in the recent BBC series Universe. The fading of that last star will only be the beginning of an infinitely long, dark epoch […]
mTOR has nothing to do with Norse mythology, it stands for “mammalian target of rapamycin” or “target of rapamycin in mammalian cells”. mTOR is involved in important cellular processes, including growth, proliferation, motility, survival, protein synthesis, transcription and autophagy. The history of rapamycin is so suggestive that I cannot avoid mentioning it: in the 1960s […]
Antiprotons appear to mirror their protons Protons and their antiprotons are mirror images of each other, according to Baryon Antibaryon Symmetry Experiment’s findings. The experiment made more than 24,000 comparisons of oscillations to precisely measure the charge-to-mass ratios. Science News Ancient black holes may be harboring dark secret Black holes that have been around since […]
For the first few million years of human evolution, technologies changed slowly. Some three million years ago, our ancestors were making chipped stone flakes and crude choppers. Two million years ago, hand-axes. A million years ago, primitive humans sometimes used fire, but with difficulty. Then, 500,000 years ago, technological change accelerated, as spearpoints, firemaking, axes […]