Back in the (I dunno 90s?) I saw that some North Eugene High School students had prototyped a device to turn a tractor's hydraulic bucket into a mobile cement mixer. I thought it was exteremely useful but never saw it again.
Five years ago Bitcoin was already at $4383.44. By December it was at $14341.02. Today its 19,298.42. So triple the holdings in 2 months. Versus quadruple to current date.
https://buybitcoinworldwide.com/price/