I like seeing what other people are interested in. Try to keep it under 15 mins and I'll watch them.
:)
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https://youtube.com/watch?v=sd6pJtR4PaY Understanding Rotary Engines. 12 minutes and change. #BrapBrap https://youtube.com/watch?t=430s&v=5SaFTm2bcac The possible origin of The Amen Break. Closer to 18 minute but the last 3 minutes aren't too chock full of information.