Pythagorean cup
Cross section Cross section of a Pythagorean cup. A Pythagorean cup (also known as a Pythagoras cup, a Greedy Cup or a Tantalus cup) is a form of drinking cup that forces its user to imbibe only in moderation. Credited to Pythagoras of Samos, it allows the user to fill the cup with wine up to a certain level. If he fills the cup only to that level, the imbiber may enjoy a drink in peace. Form and function[edit] A Pythagorean cup looks like a normal drinking cup, except that the bowl has a central column in it – giving it a shape like a Bundt pan in the center of the cup. When the cup is filled, liquid rises through the second pipe up to the chamber at the top of the central column, following Pascal's principle of communicating vessels. Common occurrences[edit] A Pythagorean cup sold in Crete A Pythagorean cup sold in Samos Hero of Alexandria (c. 10–70 AD) used Pythagorean cups as hydraulic components in his robotic systems. See also[edit] References[edit] External links[edit]
Incredible Space Pics from ISS by NASA astronaut Wheelock | triggerpit.com - StumbleUpon
Go Discovery! It was October 23, 2007 at 11:40am EST when I had my first ride to space on Discovery. She’s beautiful… just sad that this will be her last voyage. On September 22, 2010, with the departure of the Expedition 23 crew, Colonel Douglas H. We thought that we should put some of the space photos together as a tribute to him and the whole ISS crew. The following space photos are all visible on Astro_Wheels’ twitpic account, and we are eternally grateful to him for sharing these space photos with the world. Incredible Photos from Space: ‘Earthshine’… The Space Station basking in blue Earthshine as the rising sun pierces our razor-thin atmosphere to cover the Space Station with blue light. NASA astronaut Douglas H. Incredible Photos from Space: Isle Juan de Nova In the Mozambique Channel between Madagascar and the African mainland. Incredible Photos from Space: Aurora Borealis In the distance on this beautiful night over Europe.
Sonoluminescence
Single-bubble sonoluminescence - A single, cavitating bubble. Video of synthetic wound cavity collapsing creating sonoluminescence. Long exposure image of multi-bubble sonoluminescence created by a high-intensity ultrasonic horn immersed in a beaker of liquid History[edit] The sonoluminescence effect was first discovered at the University of Cologne in 1934 as a result of work on sonar. In 1989 an experimental advance was introduced by Felipe Gaitan and Lawrence Crum, who produced stable single-bubble sonoluminescence (SBSL). Properties[edit] Sonoluminescence can occur when a sound wave of sufficient intensity induces a gaseous cavity within a liquid to collapse quickly. Some facts about sonoluminescence: Rayleigh–Plesset equation[edit] The dynamics of the motion of the bubble is characterized to a first approximation by the Rayleigh-Plesset equation (named after Lord Rayleigh and Milton Plesset): Mechanism of phenomenon[edit] In 2002, M. Other proposals[edit] Quantum explanations[edit] [edit]
free university lectures - computer science, mathematics, physics, chemistry
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Personal and Historical Perspectives of Hans Bethe
Asombroso anuncio de la NASA
NASA: Hay un vórtice en el espacio-tiempo alrededor de la Tierra El pasado 4 de mayo la NASA anunció los resultados de un histórico experimento sobre el Espacio-tiempo. Según la NASA hay un vórtice de tiempo-espacio alrededor de la Tierra que además de hacer una invitación imaginativa comprueba las predicciones sobre la gravedad de Einstein. Después de casi 50 años y 750 millones de dólares la NASA por fin pudo probar la relatividad como ua condición fundamental del tiempo-espacio. Llevar la teoría a la práctica fuera del laboratorio no fue fácil. “El tiempo-espacio alrededor de la Tierra parece estar distorsionado como la relatividad predice” dijo el físico de la Universidad de Stanford Francis Everitt, líder de la investigación Gravity Probe B. En la teoría de Einstein el tiempo y el espacio están entretejidos en una fábrica cuadridimensional.
Tiny Quantum Computers in Bacteria = Efficient Solar Power
Image: "Pediastra, a flat colony of green algae", Wim van Egmond Scientists at Berkeley report a breakthrough in the riddle of how bacteria can convert sunlight to energy at efficiencies nearing 100%. And the answer is more elegant and amazing than you will believe. Imagine your favorite Sci-fi character trapped in a maze. The future of the planet depends upon finding the fastest way out. Utilizing their quantum super-powers, they run all possible combinations of the maze simultaneously in parallel universes, calculating the best path before committing to any. Now scientists led by chemistry prof Graham Flemming and lead author Gregory Engel at Lawrence Berkeley National Laboratory and the University of California, Berkeley, have achieved a breakthrough advance in understanding the photosynthesis process. Understanding the role of quantum physics in efficient use of the sun's energy may lead to break-throughs in solar power technology.
Nikola Tesla Page, Tesla Coil (Bill Beaty's Homepage)
T-SHIRTS! Hey, some people (not me) are selling Tesla t-shirts: CS Coil Tesla's Hair Tesla Co (purple plates) Cafe Press Classroom Tesla Coil $200, or a Handheld Tesla coil, $149.95, also a Micro Tesla Coil $4.95 OLD LINKS GONE BAD? Try "The Wayback Machine" It offers billions of old websites and even some of the graphics. But it's not searchable. You have to know the URL of the old site. Created and maintained by Bill Beaty.
