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Many inventions simply happen when the environment is ready for them, e.g. manufacturing techniques have advanced to the point where something is possible.

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Others get forgotten about because the funding or key manufacturing techniques don’t exist so the idea gets lost.

It can be a long way from a prototype to something worth building at scale.

The sadest are the useful ones that cant access their market, have some risk combined with small margins or an [initial] audience without money.

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