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It might only take one engineer to change light bulb but Harald Haas and pureLiFi will need lot more than that to change world of wireless connectivity. It might only take one engineer to change a light bulb but Harald Haas and pureLiFi will need a lot more than that to change the world of wireless connectivity. NegativeThe global race towards superfast fifth generation mobile internet known as 5G is entering a key phase http://www.bbc.com//news/business-458119592018-10-12