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A portable solar water heater
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The wallets look a bit naff and you need to know you are about to drop your cellphone into the water. You could just have a case that floats anytime. There are a few choices out there already.
Plastic would be better than wood, which would rot after time. You can buy them on Amazon.
This https://www.youtube.com/watch?v=d0bh9Px_V4I. Looks a bit like a life-jacket for your phone, good for sailors I guess.
Would love it if my phone floated. Better would be if it repelled water, so it didn’t matter if it got soaked in my back pocket whilst on my bike. Something like liquid glide would be a perfect coating they should use to seal phones.
Glass windows that clean themselves
(5 upvotes)Spacecraft and aircraft coatings that prevent ice build-up
(1 upvotes)Phone cases that float
(3 upvotes)Waterfall road signs
(6 upvotes)Liquid medicine containers that leave no residual medicine
(3 upvotes)Non-stick ketchup bottles
(4 upvotes)Toy balls that bounce on water
(1 upvotes)