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by jpadkins 1654 days ago
sunlight. It has the best price / benefit ratio (0) and an extremely long operational lifetime (billions of years).
2 comments
postsantum 1654 days ago
Great! Unfortunately, where I live, this item is out of stock for the next few months
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newsbinator 1654 days ago
There's no usable sunlight (on skin) for 4 ~ 8 months a year in big chunks of the populated world.
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