
KnowScience
Get flash to fully experience Pearltrees
A Slower Speed of Light | MIT Game Lab
Relativistic Baseball
NASA
RuSpace | Soyuz console
News Blog: Quantum weirdness wins again: Entanglement clocks in at 10,000+ times faster than light
No matter how many times researchers try, there's just no getting around the weirdness of quantum mechanics. In the latest attempt, researchers at the University of Geneva in Switzerland tried to determine whether entanglement—the fact that measuring a property of one particle instantly determines the property of another—is actually transmitted by some wave-like signal that's fast but not infinitely fast . Their test involved a series of measurements on pairs of entangled photons (particles of light) that were generated in Geneva (satellite view at left) and then split apart by optical fiber to two villages 18 kilometers (11 miles) apart where the team had set up photon detectors. (In 2007, researchers transmitted entangled light 144 kilometers between two of the Canary Islands .) The idea in the new experiment is that the photons in each entangled pair are hitting the distant detectors simultaneously, so there's no time for them to exchange a signal.If possible, the first images in each set will be true-color, as you would see them with your own eyes. Most images will either be true-color or monochrome (black and white), unless stated otherwise. Many images can be vastly enlarged by clicking on them and choosing a larger size from the Flickr page. Downloading them may allow even larger sizes.
State of the Nation
The Sounds of Pulsars
Sonoluminescence
Home | Practical Physics
This website is for teachers of physics in schools and colleges. It is a collection of experiments that demonstrate a wide range of physical concepts and processes. Some of the experiments can be used as starting-points for investigations or for enhancement activities. Many have links to carefully selected further reading and all include information and guidance for technicians. Physics is a practical science.Paul A.M. Dirac - Biography
UDF SkyWalker V1.0
Click-drag green circle to pan around the whole image. The Ultra Deep Field obtained by the Hubble Space Telescope is the deepest view into the sky by humankind to date. This image combines 800 frames with a total exposure time of 1 million seconds. The 10.000 galaxies that are visible have distances out to times where the universe was just 800 million years old, one seventeenth of its current age. For more info check the UDF press release at spacetelescope.org . For a wider but less deep view visit the GEMS Skywalker .Water, good ol' H 2 O, seems like a pretty simple substance to you and me. But in reality, water - the foundation of life and most common of liquid - is really weird and scientists actually don't completely understand how water works. Here are 5 really weird things about water:
5 Really Weird Things About Water
An updated version of this lesson is available at Visionlearning: Atomic Theory & Ions & Isotopes In the last lesson we learned that atoms were particles of elements, substances that could not be broken down further. In examining atomic structure though, we have to clarify this statement. An atom cannot be broken down further without changing the chemical nature of the substance. For example, if you have 1 ton, 1 gram or 1 atom of oxygen, all of these units have the same properties.

