Can blockchain be used without cryptocurrency?

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Blockchain technology supports cryptocurrencies but can also be used for supply chain tracking, identity management systems, healthcare and more.
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What Lies Within? New Image From a Mysterious Galaxy Asks Big Questions

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A detailed image reveals an unusual plasma jet structure, suggesting the presence of two merging supermassive black holes at the galaxy’s core. For more than a century and a half, the distant galaxy OJ 287, located five billion light years from Earth, has intrigued scientists with its unusual changes in brightness. Astronomers have long suspected [...] http://dlvr.it/TNNzff
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