The voluminous personal papers of Thomas Alva Edison reveal that his inventions typically sprang to life not in a flash of inspiration but evolved slowly from previous works.


sprang to life not in a flash of inspiration but evolved slowly

sprang to life not in a flash of inspiration but were slowly evolved

did not spring to life in a flash of inspiration but evolved slowly

did not spring to life in a flash of inspiration but had slowly evolved

did not spring to life in a flash of inspiration but they were slowly evolved

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