rattan mala

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How To Prove That Light Can Be Converted Into Matter

A decades-old hypothesis gets closer to solidity.<p>In 1934, two American physicists theorized that if one could make two photons collide, the collision would produce two positron-electron pairs—and thus convert light into matter. If proven in a lab, the process would be a pure demonstration of …

3D model of a nerve terminal in atomic detail

The electrochemical jelly inside your head contains something like one quadrillion synapses, the junctions at which nerve cells talk to one other by converting electrical signals into chemical ones and then back again. They have two components (sometimes three): the nerve terminal of one cell, …

APOD: A Live View from the International Space Station (2014 May 14) Credit: NASA, UStream, HDEV Project http://apod.nasa.gov/apod/ap140514.html Explanation: If you were floating above the Earth right now, this is what you might see. Two weeks ago, the robotic SpaceX Dragon capsule that delivered supplies to the Earth-orbiting International Space Station (ISS) also delivered High Definition Earth Viewing (HDEV) cameras that take and transmit live views of Earth. Pictured above, when working, is the live video feed that switches between four cameras, each pointed differently. Watch white clouds, tan land, and blue oceans drift by. The above video will appear black when it is nighttime on the Earth below, but the space station's rapid 90-minute orbit compresses this dark time into only 45 minutes. The present location of the ISS above the Earth can be found on the web. If the video appears gray, this indicates that the view is either being switched between cameras, or communications with the ISS is temporarily unavailable. As the HDEV project continues, video quality will be monitored to assess the effects of high energy radiation, which types of cameras work best, and which Earth views are the most popular. Although this feed will eventually be terminated, lessons learned will enable better cameras to be deployed to the ISS in the future, likely returning even more interesting live feeds. http://www.nasa.gov/ http://www.ustream.tv/ http://www.nasa.gov/mission_pages/station/research/experiments/917.html Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140514 #APOD

The beauty of mathematics – in pictures

The book 50 Visions of Mathematics is a collection of 50 short essays by 50 maths writers and a foreword by Dara O Briain. Launched on Wednesday to celebrate the 50th anniversary of the Institute of Mathematics and its Applications, it also contains 50 images supplied in response to an open call …

Hubble Eyes a Scale of the Universe

<b>This bundle of bright stars and dark dust is a dwarf spiral galaxy known as NGC 4605, located around 16 million light-years away in the constellation</b> …