A human body harbors around 37 trillion [1012] cells that came from a single fertilized egg by a process known as mitotic division or mitosis. While the first cellular divisions of an embryo occur without gaining mass, most of the following ones are linked to cell growth and are required for the correct development and […]
When was the last time you used a postage stamp? Even if it was a long time ago, you may have hold in your hands a strip of stamps. Maybe you have even tried to fold it into a stack, one stamp wide, so that the strip was easier to store. Have you ever wondered […]
Humanities & Social Sciences • Science • Technology • Weekly Selection
Universal formula for cosmic voids A simple equation can describe the large-scale bubbles that appear in the dark matter distributed throughout the Universe, and it applies to voids of a wide range of sizes and ages. Physics Bone-house wasps use ant carcasses to build nests for their young Deuteragenia ossarium, or the bone-house wasp, is […]
The discovery and development of new drugs is a long and expensive process, and despite of it, essential to face present and new diseases. For small molecules, which account for the majority of the marketed drugs, the discovery process generally involves finding a starting point termed hit or lead compound. These molecules have biological activity […]
…at least not on their own. So, it´s already been over half a century since the humble proposition of Watson & Crick on the structure of DNA, (one of) the molecule(s) of life: a seminal discovery for the development of molecular biology that was to become arguably the most relevant discipline in last century´s life […]
[You can read the first part here] (3) Positivism is the (philosophico-political) thesis that real knowledge reduces to the domain of established positive facts, and that all the other claims someone may make must not be taken as knowledge, but, at best, as more or less reasonable opinion . Positivism in this sense is a […]
Humanities & Social Sciences • Science • Technology • Weekly Selection
Looks like a mouse but is genetically related to elephants A tiny, long-nosed creature found in western Africa looks like a mouse, but is genetically closer to an elephant, according research published in the Journal of Mammalogy. Biologists who discovered the new species of elephant shrew call it Macroscelides micus. It lives in an ancient […]
When in April 1911 Kamerlingh Onnes and coworkers measured that the electrical resistivity of mercury suddenly vanished at 4.2K, they could not believe it. They repeated the experiment several times looking for a short circuit that could explain the weird observation. But any experimental set up was leading to the same result. They had discovered […]
Biochemistry • Biomedicine • Molecular biology • Neurobiology
Natural selection has been sculpturing living organisms for millions of years, enabling them to get adapted to an ever-changing environment. Gradually, certain traits are selected over others based on the advantage they confer to the population. Natural selection is not a random process and it relies on genetic variation. Random mutations serve as the substrate […]
Our satellite is a magnificent spectacle in the sky. Considering its size, it is only surpassed by the biggest moons of Jupiter and Saturn, in spite of the fact that the giant planets are hundreds of times bigger than the Earth. Relative to its parent body, it is by large the largest satellite in the […]