A new study co-authored by a University of Wisconsin-Madison professor finds that life expectancy gains made by high-income countries in the first half of the 20th century have slowed significantly, and that none of the …
I think the biggest cause was actually not groundbreaking stuff, but our understanding of microorganisms and our changes in hygiene (all summarized in better education).
Vaccines. Antibiotics. Cardiac drugs.
All now no longer researched.