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Suresh Krish
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August 6, 2014
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                       The Bigar Cascade

this is the Bigar Cascade Falls in Carass Severin, Romania
 The dramatic moss-covered falls are situated in the forests of the Anina Mountains and is formed by an underground water spring that spills into the Minis River. Photograph by SANDRA RUGINA
YouTube : This is the Bigar Cascade Falls
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Lightning captured at 7,207 images per second

How fast is lightning? Lightning, in fact, moves not only too fast for humans to see, but so fast that humans can't even tell which direction it is moving. This lightning stroke did not move too fast, however, for this extremely high time resolution video to resolve. Tracking at an incredible 7,207 frames per second, actual time can be seen progressing at the video bottom. This lightning bolt starts with many simultaneously creating ionized channels branching out from an negatively charged pool of electrons and ions that has somehow been created by drafts and collisions in a rain cloud. About 0.015 seconds after appearing - which takes about 3 seconds in this time-lapse video - one of the meandering charge leaders makes contact with a suddenly appearing positive spike moving up from the ground and an ionized channel of air is created that instantly acts like a wire. Immediately afterwards, this hot channel pulses with a tremendous amount of charges shooting back and forth between the cloud and the ground, creating a dangerous explosion that is later heard as thunder. Much remains unknown about lightning, however, including details of the mechanism that separates charges

Explanation from: http://apod.nasa.gov/apod/ap120723.html

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To combat global warming, scientists in Scotland now suggest an out-of-this-world solution — a giant dust cloud in space, blasted off an asteroid, which would act like a sunshade for Earth.

Read more: http://nbcnews.to/PiqEwc
Photo: Charlotte Lücking / ESA / NASA
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