Heat is one of the most wasted energy sources in the history of histories.
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RT @denverbitcoin
I love miniature working Stirling engines — just finished putting this one together.

Converting heat energy into mechanical motion back into electrical/light energy...fascinating.

This 4 cylinder model is absolutely amazing.

One of the best gifts I’ve ever received 💯
https://twitter.com/denverbitcoin/status/1503843913907511303