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Free energy mod!
(startrek.website)
A place to post ridiculous posts from linkedIn.com
(Full transparency.. a mod for this sub happens to work there.. but that doesn't influence his moderation or laughter at a lot of posts.)
The other one being to shine a light on a solar panel. For bonus points you include a mirror and a vampire.
I remember the one where he uses two magnets, and the one where he wraps his head with a bag and puts a plant inside it, so he can swim with infinite O2 supply.