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The change from 1800 to 1950 is mostly caused by soap, and the change from 1950 to 2015 by penicilline and the Haber process.
Not even. The biggest change is due to crazy high infant mortality rates no longer drastically reducing the average
Yes, and what caused the reduction in infant mortality?
Soap. Or rather the revolutionary idea that it would be good if doctors and midwives used it.
Which was largely due to the introduction of soap and hygiene practices during childbirth.
Do not forget vaccines.
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