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It does sound amazing and economical, like almost too good to be true, but I very much hope it is true. What are the downsides? Is there a degradation problem or something similar? Other than the stoner connection in people's minds, what kind of resistance is there to this? Why isn't it widely known?

You know, I'm not sure. This article is from a few years ago now and there's not much uptake.

It may be that most people dismiss supercapacitors based on the stats for legacy (pre-graphene/pre-hemp) supercapacitors: large but quick and long-lasting.

It may be that hemp is taxed at up to 90% because it's a controlled substance in the US (but not in Europe, Canada, or China; where we must import shelled hemp seeds from). A historical accident?

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