We have lost more than we have kept in inventions. I am trying to say that humanity would be even more, if more inventions were not suppressed or lost. What about "Greek fire" vs napalm? "Eternal flame" vs LED lights? "Powdered gold" vs monoatomic gold? We cannot replace these today, let alone all the fuel-efficiency devices.
If we could get get a washing machine and a toilet to the people making less than $2 a day, think how we could revolutionize their areas of the world!
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Unfortunately, that is true. We have lost a lot of technologies to time. Some were due to nature's fault and some were due to mankind. In fact a lot were due to mankind.