Amplifying Voltage If we place a large resistor in a circuit containing a transistor we can amplify the incoming voltage, since according to Ohm’s law voltage is equal to current times resistance. So a current crossing a small resistance corresponds to a small voltage. But if the same current is made to cross a much […]
Author: Leire Gartzia Rivero got a Chemistry degree and completed her Master studies in “New Materials” at the University of the Basque Country. She holds a Ph.D. in Materials Science and Technology obtained at the same university, in the Molecular Spectroscopy Laboratory, where she focused on the spectroscopic characterization of photoactive nanomaterials based on energy […]
It is not only a piece of matter that moves but also a universe of meanings and contexts. For philosophers, the word Meaning is everything but trivial. In a crowded street, you may point the location of the closest train station by extending your arm at speed in the direction of someone else’s head – […]
Humanities & Social Sciences • Science • Technology • Weekly Selection
Nonhuman primates may be involved in Zika transmission Scientists who collected biological samples from 15 wild marmosets and eight pet capuchin monkeys plus one free-ranging capuchin in Brazil found four marmosets and three capuchins had been infected with the Zika virus. The Scientist Cosmic-particle technology opens window into Bent Pyramid New cosmic-particle technology has allowed […]
As an intellectual discipline, moral philosophy is afflicted by a very deep ambivalence. On the one hand, moral philosophers have always pursued to have a prominent position in the debates about what is morally good and what is morally bad; most of their theories can be interpreted hence as sophisticated attempts to answer the old-as-mankind […]
Nanoparticles of certain metals, like gold or silver, have attracted substantial interest in recent years owing to their ability to support localized surface plasmon resonances (collective oscillations of conduction electrons). These plasmonic excitations allow manipulation of light at the nanoscale and have enabled technological advances ranging from improved catalytic and photovoltaic cell efficiencies to sensitive […]
Biology • Biomedicine • Health • Medicine
What are lysosomes doing inside your cells? When I was in High School my teacher used to say that lysosomes are only the trash bin of the cell. 20 years later we have discovered a dozen new functions that make this small organelle a core component of the cell. You may already know that the […]
The Sahara is the world’s largest hot desert covering about one quarter of the African continent. The sun is constantly up and makes some spots in the Sahara the hottest and driest on Earth, with average highest temperatures above 38 degrees Celsius and very low, if any, annual rainfall. As fresh water dwindles, most of […]
Humanities & Social Sciences • Science • Technology • Weekly Selection
Dali painting used in study of how brain processes information Scientists used a painting by Salvador Dali to help them discover how the brain processes information. Researchers asked study participants to examine Dali’s 1940 work “Slave Market with the Disappearing Bust of Voltaire,” which is visually ambiguous. “We found very early on … that the […]
Anthropology • Biology • Evolution • Genetics
Neanderthals ( Homo neanderthalensis ) were a species –some say a subspecies although most authors consider there is enough evidence to consider them as a separate species– of human closely related to us. They were firstly discovered in a cave in the Neander Valley («Tal» in German), about 12 km east of Düsseldorf. There is […]