“Walpurgisnacht”: the witches’ night

noche de walpurgis-walpurgisnacht-brujas-brujeria-noche bruja-satanismo-aquelarre-sabbat

I imagine you are all prepared for this unique night. What is going to be celebrated? Today is the “witches’ night”, one of the most important festivities of the witches’ calendar in Northern Europe. On this night, one of the most intense and frightening witches’ sabbaths of the year takes place at the Brocken Peak … Read more

Types of snakes according to their fangs

vibora-serpiente cascabel-serpiente solenoglifa-colmillo-veneno-tipos de serpiente-denticion serpientes

Snakes have often been associated with evil, either for cultural reasons or, directly, because of our survival instinct. We fear and respect them and the venom they use to hunt and defend themselves. However, as it usually happens, fear is diluted when our knowledge about them increases. In fact, they are not all equally poisonous … Read more

Electrical therapies in ancient times

escribonio largo-medicina en la antiguedad-electroterapia-roma-romanos-grecia-griegos-platon-aristoteles-pez torpedo-raya electrica-pez gato electrico del nilo-Malopterurus electricus-gota-dolores de cabeza-prolapso anal-dioscorides-galeno

Most of us are familiar with or have heard of electricity-based therapies. They are used in a wide range of medical disciplines: neurology, psychiatry, physical medicine, rehabilitation… Logically, we consider these techniques an advance of the modern world, because if electricity had not been discovered, they could not exist. It is true that electricity is … Read more

The origin of nativity scenes

san francisco de asis-franciscanos-navidad-belen-belenes-arte-origen del belen-francisco de asis-milagros-cristianismo

The nativity scene tradition has become a true artistic expression. There are orthodox and heterodox nativity scenes worthy of admiration for their level of detail and complexity, not to mention the exquisite craftsmanship of some of their figures. Where does it come from? When did we start representing the events surrounding the birth of Jesus … Read more

“Smokescreen”: An expression with a military history

cortina de humo-dichos populares - expresion -guerra-armas-segunda guerra mundial-primera guerra mundial-distraccion-politica-dichos

“Smokescreens” are a strategy increasingly employed by politicians and the media to divert mass attention away from the truly important things and hide them. The expression has, therefore, a metaphorical use today, but not long ago it was used (and still is) in the military field to confuse adversaries and acquire strategic advantage. Let us … Read more

The crosswords that almost ruined the Normandy landing

desembarco de normandia-dia d-crucigramas-MI5-overlord-segunda guerra mundial-alemania-leonard dawe

D-Day, Operation Overlord, the Normandy landing. They are all synonymous referring to the most famous military operation of World War II that largely determined the final outcome of the greatest war in history. It began to be conceived as early as 1943 by Winston Churchill and Franklin D. Roosevelt, although they had to wait until … Read more

Six curiosities you didn’t know about Venus

magallanes-venus-tierra-universo-espacio-atmosfera-dioxido de carbono- co2-azufre-condiciones para la vida-agua-tectonica de placas-vulcanismo-volcanes

Venus is considered the brother planet of the Earth. However, since their births they have followed different trajectories that have led them to very different destinies. The current atmosphere of Venus is composed of 96.5% carbon dioxide. Toxic clouds of sulfur dioxide travel rapidly through it. But Venus has not always been so unwelcoming. It … Read more

The 5 most important facts about the plague you should know

peste negra-muerte negra-edad media-peste septicemica-peste neumonica-peste bubonica-doctor de la peste-justiniano-yersinia pestis-ratas-pulga

“¡How many brave men, how many beautiful women, how many gallant young men whom Galen, Hippocrates, or Aesculapius would have judged to be very healthy, ate breakfast with their relatives, companions, and friends, and in the evening dined with their ancestors in the other world!” – The Decameron, Bocaccio 1. The disease can occur in … Read more

The sighting that made UFOs famous

kenneth arnold-ovnis-ufos-ufologia-ovni-monte rainier-24 de junio de 1947-washington

June 24, 1947. A turning point occurred. The phenomenon of Unidentified Flying Objects gained its eternal fame. All the films, books, series and other elements of the popular culture inspired by UFOs have their origin in that very moment. The pilot Kenneth Arnold was flying over Mount Rainier in Washington State that day, looking for … Read more

Boundary layer: a tool to protect against the cold

capa limite-grosor-viento-frio-superficie-plumaje-pelaje-piloereccion-ptiloereccion-fisiologia-biologia

Endotherms, like mammals and birds, mainly use two methods to minimize heat loss by convection in cold environments: .Increasing heat production Reducing heat loss by increasing the efficiency of the insulation, but how? By empowering the BOUNDARY LAYER. The boundary layer is a layer of fluid (water or air) adjacent to the surface of an … Read more

Eugene Shoemaker, the only human being that rests on the moon

Eugene Shoemaker-Nightwish-luna-viaje a la luna-geologia-astronomia-asteroides-ciencia

Although his life was extinguished prematurely in a tragic car accident in 1997, we can assure that Eugene Merle Shoemaker had a full life. He was able to do everything he ever dreamed of. An early intellect allowed him to enter college at age 16, and not just any college, but the prestigious California Institute … Read more