*Problem 1:
*full presentation:
google "Powerpoint Presentation: Walter Orr Roberts: Our Energy challenge"
*video presentations
(download file:
Agci-OurEnergyChallenge556_512kb.mp4right klikk..save as..!)
https://ia700307.us.archive.org/29/items/Agci-OurEnergyChallenge556/
*a decent documentary
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