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I'm not sure the idea batteries are stagnating is really accurate, especially since some of the material science advancements that would help hydrogen would also help batteries, es…

Nope. You pretty much have it covered. Hydrogen was very appealing when battery and hydrogen storage both needed significant development, but batteries have come a long way while h…

Yes, up to 35% during the Carboniferous period, which allowed a whole host of creatures to get much bigger than they are today. I'm not sure when it dropped to the modern 21%, thou…