A bowling ball and feather fall in world's biggest vacuum chamber The combination of bowling ball and feather is the perfect way to demonstrate air resistance, also known as drag. Because the shape of the feather allows it to endure way more air resistance than the bowling ball, it takes much longer to fall to the ground. British physicist Brian Cox wanted to see this primary-school problem play out in a vacuum, where there is zero air resistance to mess with the results. Filming for his new BBC 2 show, Human Universe, he travelled to the US and visited the NASA Space Power Facility in Ohio. When not in use, the chamber contains around 30 tonnes of air, but when it’s turned on, all but around 2 grams of air are sucked out to create an artificial vacuum. Source: io9
Rome Reborn A brand new particle has been predicted by physicists Scientists have predicted the existence of an unexpected new particle called the type-II Weyl fermion. It's closely related to the Weyl fermion, which researchers first predicted 85 years ago but only found earlier this year. But no one had ever expected that it might have a cousin, as the new particle appears to defy a lot of universal rules. The type-II Weyl fermion was predicted when researchers noticed that a metallic crystal material known as tungsten ditelluride was behaving in a strange way. When a team of international researchers led by Princeton University investigated what was going on, they predicted that the behaviour was the result of an unexpected new particle, the type-II Weyl fermion. The metallic material that are predicted to contain the type-II Weyl fermions is a condensed matter solid – a class of crystals that researchers call a "material universe" because of the incredible wealth of particles they contain. A crystal of tungsten ditelluride.
Hear The Epic of Gilgamesh Read in the Original Akkadian and Enjoy the Sounds of Mesopotamia Long ago, in the ancient civilization of Mesopotamia, Akkadian was the dominant language. And, for centuries, it remained the lingua franca in the Ancient Near East. But then it was gradually squeezed out by Aramaic, and it faded into oblivion once Alexander the Great Hellenized (Greekified) the region. Now, 2,000+ years later, Akkadian is making a small comeback. At Cambridge University, Dr. Martin Worthington, an expert in Babylonian and Assyrian grammar, has started recording readings of poems, myths and other texts in Akkadian, including The Epic of Gilgamesh. Follow Open Culture on Facebook and Twitter and share intelligent media with your friends. If you'd like to support Open Culture and our mission, please consider making a donation to our site. via Heritage Key Related Content: World Literature in 13 Parts: From Gilgamesh to García Márquez The Ancient History Learning Guide What Ancient Greek Music Sounded Like: Hear a Reconstruction That is ‘100% Accurate’
superlune2 Alexander the Great: Was he a Unifier or a Subjugator? Interpreted by many historians as proof of a vision for the unison of man, much of Alexander’s dealings in Persia have come to be attributed with a policy of racial fusion. Accordingly, echoed in numerous sources is an idealistic image of Alexander as a Christ-like humanitarian destined to be the saviour and unifier of mankind, while the Alexander whose entire existence orbited strategy and bloodshed is often outshone by this romantic ideal. According to classical scholar Ernst Badian, the Alexander who dreamt of a unity of mankind is nothing but an illusory figure concocted in the mind of scholar Sir William Tarn who conceived Alexander as an agent of the brotherhood of man, and I equally doubt that Alexander was ever inspired by some philanthropic desire to federate humanity. Several pivotal occurrences of Alexander’s short career have frequently been judged as confirmation of his so called visionary policy of racial fusion.
lunar phases elliptical orbit Les Gaulois en Orient Thanks To The Magnus Effect, This Basketball Does Something Pretty Weird When Dropped Drop a basketball from a height, you've got a few flights of stairs to descend to retrieve it and you might even owe an apology to an angry passer-by. But if you give it enough height and add a dash of backspin, you can watch it say GOODBYE, FRIEND as it curves a great distance away from its intended flight path. This is the Magnus effect, where the descending, spinning basketball drags air around it, forming areas of lower pressure and high pressure, causing it to swerve away. Veritaserum/YouTube Check out this video below from Veritasium, where Derek Muller explains more about the fascinating phenomenon. [H/T: io9]
La machine qui tirait au sort les citoyens d’Athènes Pierre Gaurier, société SNBR Liliane Rabatel, archéologue ambiance Liliane Rabatel Nicolas Bresch, architecte-archéologue Liliane Rabatel Nicolas Bresch Liliane Rabatel Nicolas Bresch Liliane Rabatel Nous sommes à Sainte-Savine, dans le département de l’Aube, dans les locaux d’une entreprise qui fait revivre les objets du passé… Aujourd’hui il ne s’agit pas de restaurer un monument ancien mais de créer une étonnante machine, issue de la démocratie athénienne !On va délimiter une zone qui est la zone verte, de travail, pour pas aller travailler sur toute la zone de la pièce. Tankar om energi Tankar om energi Ämnen: Fy, Bi, Ke, Ge, (Tk, Sh, Hkk) Energi finns överallt och vi använder den hela tiden, fastän den inte ens syns. Men vad är egentligen energi? Målet med Tankar om energi är att eleverna ska få kunskaper om människans beroende av naturen, men också om hur vi påverkar den. | Läroplanskoppling Tankar om energi (pdf) Material och verktyg: Energifallets bildspel till Tankar om energi. Genomförande Förbered genom att läsa igenom att klicka dig vidare till texterna till respektive bild nedan. Vill du redan nu förebereda för dokumentation av klassens arbete med Energifallet? Klicka på bilderna för att komma till frågor och faktatext till respektive bild. Energi finns överallt! > Frågor och fakta tillAllt är energi! Solen skiner oavbrutet. > Frågor och fakta till Solenergi! Ständigt nås jorden av ungefär10 000 gånger mer energi än vi människor använder – det gäller bara att fånga energin! > Frågor och fakta tillFånga energin! Energi behövs överallt.
Ancient History Encyclopedia — GLADIUS HISPANIENSIS: The gladius Hispaniensis or... The Ancient Way of Life — ~ Discus-thrower (discobolus). Date: A.D. 100-199...