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Desrtopa comments on Brain Preservation - Less Wrong
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The first that came to my mind was the photovoltaic effect, discovered by Alexandre Edmond Becquerel in 1839. Even today it takes massive subsidies to make photovoltaics competitive. And we are not even close to the energy efficiency of photosynthesis.
I bet there are a lot of other examples.
There's a big difference though, between "This technology has not been realized" and "this technology is not cost competitive with other technologies for similar purposes."