Howabout low power? ESP8266 are not always the most efficient choice vor low power.
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Five-hundred-meter Aperture Spherical Radio Telescope (FAST)
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Berkeley Engineers Design Flying Swappable Batteries for Drones to Maintain Flight
ET phone home (or SETI)
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Visualising 1 minute on the Internet in 2019
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shocking 
Putting my cynic hat on (what me !) what is significantly missing from the pie chart is how much money is scammed and or stolen via the Internet every minute …
And how many of the 188 Million emails are spam.
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