This video covers the most important trending technology to learn.
block chain: https://www.youtube.com/watch?v=QCvL-DWcojc
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https://www.youtube.com/watch?v=G1jD_UejqBs
In this video you will know what is supernova and when will be exactly this explosion takes place.
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https://www.youtube.com/watch?v=GEdnSl9GQ0I