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Millions of cryptocurrency investors have been scammed out of massive sums of real money. In 2018, losses from cryptocurrency-related crimes amounted to US$1.7 billion. The criminals use both old-fashioned and new-technology tactics to swindle their marks in schemes based on digital currencies exchanged through online databases called blockchains.

A sister company of Google, Alphabet’s Wing Aviation, just got federal approval to start using drones for commercial delivery. Amazon’s own drone-delivery program is ready to launch as well. As drones take flight, the world is about to get a lot louder – as if neighborhoods were filled with leaf blowers, lawn mowers and chainsaws.