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Michelson–Morley experiment. Figure 1.

Michelson–Morley experiment

Michelson and Morley's interferometric setup, mounted on a stone slab and floating in a pool of mercury. The Michelson–Morley experiment was performed in 1887 by Albert Michelson and Edward Morley at what is now Case Western Reserve University in Cleveland, Ohio.[1] It attempted to detect the relative motion of matter through the stationary luminiferous aether ("aether wind"). The negative results are generally considered to be the first strong evidence against the then prevalent aether theory, and initiated a line of research that eventually led to special relativity, in which the stationary aether concept has no role. [A 1] The experiment has been referred to as "the moving-off point for the theoretical aspects of the Second Scientific Revolution". [A 2] Cahier physique - physics workbook. PART I click here (from Copernicus to Newton) movie to watch: greatest discoveries in Astronomy from discovery channel (42 minutes)Willam Herschel He gave up music for astronomy.

cahier physique - physics workbook

Photographer Johnny Joo captures images of abandoned trains in North Carolina. The train graveyard was discovered by urban explorer and photographer Johnny Joo There are more some 78 trains spread across a North Carolina forestThe trains are from cities such as Philadelphia and there is a bus from New York too By Travelmail Reporter Published: 13:43 GMT, 27 July 2014 | Updated: 16:28 GMT, 27 July 2014 A ‘graveyard’ of more than 70 trains from all over the United States was discovered by a young photographer and urban explorer in a forest in North Carolina.

Photographer Johnny Joo captures images of abandoned trains in North Carolina

The trains, once filled with people, now sit decaying on winding tracks stretching through the snowy forest, infusing visitors with a certain apocalyptic feel. Mathematik: Inhaltsübersicht – Wikibooks, Sammlung freier Lehr-, Sach- und Fachbücher. Einführung in die Theoretische Physik - Ein Lehrbuch in mehreren Bänden – Wikibooks, Sammlung freier Lehr-, Sach- und Fachbücher. Einführung in die Theoretische Physik - Ein Lehrbuch in mehreren Bänden Aus Wikibooks Wechseln zu: Navigation, Suche Dieses mehrbändige Werk steht im Regal Physik sowie im Regal Maschinenbau.

Einführung in die Theoretische Physik - Ein Lehrbuch in mehreren Bänden – Wikibooks, Sammlung freier Lehr-, Sach- und Fachbücher

Hier gibt es eine PDF-Version [1]. Von „ Biologist warn of early stages of Earth's sixth mass extinction event -- ScienceDaily. The planet's current biodiversity, the product of 3.5 billion years of evolutionary trial and error, is the highest in the history of life.

Biologist warn of early stages of Earth's sixth mass extinction event -- ScienceDaily

But it may be reaching a tipping point. In a new review of scientific literature and analysis of data published in Science, an international team of scientists cautions that the loss and decline of animals is contributing to what appears to be the early days of the planet's sixth mass biological extinction event. Lists of unsolved problems. Why Probability in Quantum Mechanics is Given by the Wave Function Squared. One of the most profound and mysterious principles in all of physics is the Born Rule, named after Max Born.

Why Probability in Quantum Mechanics is Given by the Wave Function Squared

In quantum mechanics, particles don’t have classical properties like “position” or “momentum”; rather, there is a wave function that assigns a (complex) number, called the “amplitude,” to each possible measurement outcome. The Born Rule is then very simple: it says that the probability of obtaining any possible measurement outcome is equal to the square of the corresponding amplitude.

(The wave function is just the set of all the amplitudes.) Library - Google Search. History of writing. The history of writing is primarily the development of expressing language by letters or other marks[1] and also the study and description of these developments.

History of writing

In the history of how systems of representation of language through graphic means have evolved in different human civilizations, more complete writing systems were preceded by proto-writing, systems of ideographic and/or early mnemonic symbols. True writing, in which the content of a linguistic utterance is encoded so that another reader can reconstruct, with a fair degree of accuracy, the exact utterance written down[A 1] is a later development. It is distinguished from proto-writing which typically avoids encoding grammatical words and affixes, making it more difficult or impossible to reconstruct the exact meaning intended by the writer unless a great deal of context is already known in advance. Why study things? - An introduction to material culture. Why study things?

Why study things? - An introduction to material culture

Or put another way, what can we learn from objects that we can’t find out from the reading of texts? There’s no simple answer to these questions but, as we shall discover in the course of this unit, there’s no getting around the ubiquity of things. This unit is an adapted extract from the Open University course Making sense of things: an introduction to material culture (A151)23 [Tip: hold Ctrl and click a link to open it in a new tab.

Oulipo. Oulipo (French pronunciation: ​[ulipo], short for French: Ouvroir de littérature potentielle; roughly translated: "workshop of potential literature") is a loose gathering of (mainly) French-speaking writers and mathematicians which seeks to create works using constrained writing techniques.


It was founded in 1960 by Raymond Queneau and François Le Lionnais. Other notable members have included novelists Georges Perec and Italo Calvino, poets Oskar Pastior, Jean Lescure and poet/mathematician Jacques Roubaud.


How Your Brain Can Control Time | Memory, Emotions, & Decisions. If Buonomano turns out to be right, he will have explained only our fastest time telling, because after half a second, the brain’s ripples dissipate.

How Your Brain Can Control Time | Memory, Emotions, & Decisions

On the scale of seconds to hours, the brain must use some other strategy. Warren Meck of Duke University argues that the brain measures long stretches of time by producing pulses. But the brain does not then count the pulses in the way a clock does. Instead, Meck suspects, it does something more elegant. It listens to the pulses as if they were music. Optische Täuschungen - SPIEGEL ONLINE - Nachrichten. Panspermia. Illustration of a comet (center) transporting a bacterial life form (inset) through space to the Earth (left) Panspermia (Greek: πανσπερμία from πᾶς/πᾶν (pas/pan) "all" and σπέρμα (sperma) "seed") is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids, comets[2] and planetoids.[3] Panspermia is the proposal that life forms that can survive the effects of space, such as extremophiles, become trapped in debris that is ejected into space after collisions between planets that harbor life and small Solar System bodies (SSSB).

Some organisms may travel dormant for an extended amount of time before colliding randomly with other planets or intermingling with protoplanetary disks. Near-Earth object. Animation of the rotation of 433 Eros, a Near-Earth asteroid visited by an unmanned spacecraft A near-Earth object (NEO) is a Solar System object whose orbit brings it into proximity with Earth. All NEOs have a closest approach to the Sun (perihelion) of less than 1.3 AU.[2] They include a few thousand near-Earth asteroids (NEAs), near-Earth comets, a number of solar-orbiting spacecraft, and meteoroids large enough to be tracked in space before striking the Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of the planet.[3] NEOs have become of increased interest since the 1980s because of increased awareness of the potential danger some of the asteroids or comets pose to Earth, and active mitigations are being researched.[4]

Humanzee. Terminology[edit] Geneticists generally use portmanteau words to describe hybrids, with the order of syllables indicating which parent is which. This is important because of genomic imprinting: genes are expressed differently depending on which parent contributed them. Pleiades. Observational history[edit] The Pleiades are a prominent sight in winter in both the Northern Hemisphere and Southern Hemisphere, and have been known since antiquity to cultures all around the world, including the Māori, Aboriginal Australians, the Persians, the Arabs (known as Thurayya), the Chinese, the Japanese, the Maya, the Aztec, and the Sioux and Cherokee. In Tamil culture this star cluster is attributed to Lord Murugan (Lord Murugan raised by the six sisters known as the Kārththikai Pengal and thus came to be known as Kārtikeyan). In Sanskrit he is known as Skanda. The Nebra sky disk, dated c. 1600 BC.

The cluster of dots in the upper right portion of the disk is believed to be the Pleiades. Schiefer. In der wissenschaftlichen Literatur wird das Wort Schiefer (ahd. scivaro, mhd. schiver(e) ‚Steinsplitter‘, ‚Holzsplitter‘; mittelniederdeutsch schiver ‚Schiefer‘, ‚Schindel‘) ohne weitere Zusätze nicht mehr als Gesteinsname verwendet. Schieferarten[Bearbeiten] Schiefer aus der Gruppe der undeformierten Sedimentgesteine[Bearbeiten] Tonschiefer[Bearbeiten] Erinyen. Proper motion. Universal Time. List of common misconceptions. William James Sidis. Seclusion. Ancient astronauts. Out-of-place artifact.