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AP Photo

Astrodome, 1966


Astroturf is installed for the first use of artificial turf in sports.

Ex-infielder Dick Allen famously said,"If horses won't eat it, I don't want to play on it." Nonetheless, because grass could not grow under the Astrodome roof, artificial turf was developed to replace it. It took decades before sports -- and athletes' knees -- would recover.