"The phonograph and the electric light were but two of the fruits of Thomas Edison's fecund mind."
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NOTE:
"Fecund" and its synonyms "fertile," "fruitful," and "prolific" all mean producing or capable of producing offspring or fruit, but each carries that sense a little differently.
"Fertile" implies the power to reproduce or to assist in reproduction and growth, while "fecund" emphasizes abundance or rapidity in bearing fruit or offspring.
"Fruitful" adds the implication that the results attained are desirable or useful, and "prolific" stresses rapidity of spreading or multiplying.