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Harry Potter DIY
Water Shooting Magic Wand
Absolutely amazing! Best idea ever! I was thinking you would be using one of those instant bike wheel pump up things that are pressurised but this is even better!
DIY Hot Wire Cutter for Plexiglass, Cardboard and Foam
Plywood Hot Wire Foam Cutter
Stress Makes Art: Galvanic Skin Response and Visual Generation
Impossible Balance Board Illusion
Build a Helpful "Writers Block"
DIY Prosthetic Hand
Portable Personal Cooling System
I don't think the Peltier would be strong enough to substitute for the ice but I'm fairly sure it could be used to cool down the water on return and allow you to recirculate it. Even if you couldn't 100% maintain thermal equilibrium, it might extend the working period significantly. In any case you earned my vote for this competition :-)
DIY Robotic Appendages
have you considered using a Peltier to regulate the reservoir temperature? It would need some radiative fins on the back to have somewhere to pump the heat to, but it could be done I think... Also, could this be powered by a solar panel on the camelback?
Folding Electric Ukulele
Galantis Seafox Mask
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