very difficult for kids to swallow. So a chemist at this startup came up with the brilliant idea of dissolving the sulfa drug
Steven Johnson: How humanity doubled life expectancy in a century | TED · TED
How native speakers pronounce “chemist”
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very difficult for kids to swallow. So a chemist at this startup came up with the brilliant idea of dissolving the sulfa drug
Steven Johnson: How humanity doubled life expectancy in a century | TED · TED