David Livingstone developed his own medicine and pioneered a systematic dosage to combat malaria while in Africa. The main ingredient was quinine, found in the bark of the South American cinchona tree. Branded back home as the 'Livingstone Rouser' -- it was marketed and sold for forty years. Secrets of the Dead: The Lost Diary of Dr. Livingstone airs Wednesday, March 26 at 10 p.m. ET on PBS (check local listings). For more, visit
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