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David Anderson
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"We never taught it to do that," says one researcher.
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What is lightning? - post for Matt
Clouds may look fluffy and innocent, but they are actually active places. Water and ice move around inside the cloud; forced up by warm air currents, down by gravity, and compressed in the cloud. Just as rubbing a balloon can create static electricity, the particles in the cloud become charged. Charges separate in the cloud. Positive charges move up, and negatives move down.

Once a significant charge separation has built up, the positive and negative charges seek to reach each other an neutralise. ‘Streamers’ come up from the ground to form a pathway. Once a pathway is completed a spark forms, neutralizing the charge.
As the negative charge races down, the air surrounding it heats up.The spark is very hot at almost 20,000 degrees Celsius, and it rapidly heats the air to create a shock wave.

Considering light travels very fast – about 300 million metres per second, and that sound only travels at 300 metres per second; light is a million times faster than the sound produced. To find out how far away the storm is, you can count how long you hear the sound after the lightning. For every 4 seconds between the flash and the rumble, the thunderstorm is 1 mile away.

Watch:
www.youtube.com/watch?v=h-0gNl5f4BU

Source:
http://www.sciencemadesimple.co.uk/activity-blogs/lightning

What causes lightning?:
http://www.planet-science.com/categories/over-11s/natural-world/2012/06/what-causes-lightning.aspx

#naturalphenomena   #lightning   #science  
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Hatching Gecko
When the gecko egg is ready to hatch, you will see it wrinkle and shrink. The egg has not gone bad and the baby is getting ready to hatch. The gecko will create a slit using its egg tooth and then force its way out.

Once the newborn is free, leave it in the incubation cup until its first shed which usually occurs within the first day. As it sheds the gecko will eat the skin. The shed skin is nutritional and important to a newborn gecko.

Reference:
http://www.albeysreptiles.com/incubate-eggs.htm

Watch:
https://www.youtube.com/watch?v=gRhLMGgsfpc

  #gecko   #hatching   #biodiversity   #coolcritters  
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Your brain does not process information, retrieve knowledge or store memories. In short: your brain is not a computer
Your brain does not process information, retrieve knowledge or store memories. In short: your brain is not a computer
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Hyundai's Wearable Robot Gives You Extra Strength
http://www.gadgetify.com/hyundais-wearable-robot/
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I'm tired of seeing photos of these, I want one now! We've been teased for far too long.
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There's no sign-up process.
Google's newest social app is called Google Spaces. Here's why you should use it, and how.
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Will be good for more private chats with friends and family I guess..or around a specific subject .

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Shouldn't we be more inclusive with Telomere and Stem-Cell combined genetic research?
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Imgur: The most awesome images on the Internet.
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Relativistic jets and the Collapsar model
Gamma-ray bursts (GRBs) were first detected by American nuclear detection surveillance satellites in the late 1960s. The Vela spacecraft series were designed to monitor world-wide compliance with the 1963 Nuclear Test Ban Treaty. The satellites detected no clandestine nuclear explosions, but they discovered something far more interesting: powerful bursts of gamma rays emanating from random directions in space. By analyzing the different arrival times of the bursts as detected by different satellites, scientists concluded that the sources of the bursts were cosmic and not terrestrial or solar. The discovery was declassified and published in 1973 as an Astrophysical Journal article entitled “Observations of Gamma-Ray Bursts of Cosmic Origin”. This alerted the astronomical community to the existence of gamma-ray bursts (GRBs), now recognized as the most violent events in the universe.

To this day GRBs remain one of the greatest mysteries of modern astronomy. We know that GRBs lasting less than 2 seconds (short GRBs) may originate from a variety of processes. There are several theories that explain how the energy from a gamma-ray burst progenitor is turned into radiation. One hypothesis describing how long gamma-ray bursts originate is called the “collapsar” model: gamma-rays are generated when massive, spinning stars collapse to form black holes and spew out powerful jets of plasma at nearly the speed of light.These stellar collapses (collapsars) are thought to be similar to supernovae, except that a jet is produced by the accretion of stellar material onto a compact object formed at the center of the collapsing star.


These jets are called ’relativistic jets’ and they can transport the energy from the collapsed core to large distances. Inside the jet, the uneven distribution of temperature, density and pressure create internal shock waves that move inward and outward as faster regions within the jet collide with slower ones. The collisions between the fast-moving gas and its surroundings, as well as within the jet itself, create gamma rays. When the jet hits the surrounding interstellar medium it produces another shock wave. This causes particles to rapidly lose energy (fast cooling), due to the strong magnetic field in the GRB emission region, through a process known as synchrotron radiation. This phenomenon is observed as long gamma-ray bursts and it’s followed by a so-called “afterglow”, a slowly fading emission that can be seen at all wavelengths; starting with X-rays, followed by ultraviolet, visible and infrared light, and eventually radio waves.The afterglow can last for days or even weeks.

References:
http://arxiv.org/pdf/1311.5623v2.pdf
http://w.astro.berkeley.edu/~ishivvers/sne.html
http://arxiv.org/pdf/astro-ph/0206004v1.pdf
http://www.nasa.gov/centers/goddard/pdf/97767main_GRB_primer.pdf

Article:
http://news.stanford.edu/news/2013/november/gamma-ray-burst-112113.html

Watch:
www.youtube.com/watch?v=BuMCP4pQvhY
Credit: NASA’s Goddard Space Flight Center

#nasa   #goddard   #astrophysics   #GRB   #collapsar   #space  
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 I am an IT professional  with special interest in virtualization.

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History geek, knowledge junkie, spectator.
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software engeneer