When Amazon launched the Echo back in late 2014, it kicked off one of the biggest trends in tech. Almost overnight, it seemed like every company wanted to get in on that sweet smart speaker action. However, largely because Amazon was first to market, the Echo has consistently been the top-selling smart speaker for the last three and a half years.
If you want to send something deep, deep into space, it's impractical to load it up with lots of heavy propellant. Scientists with their eyes on long-distance space travel have contemplated thrusters that wouldn't need any propellant at all. The EmDrive, a copper cone that would supposedly push forward on the vacuum of space without any propellant, is one such idea — unfortunately, it's probably another dead end.