3 ms·
Off the top of my head; vaccines, vitamin pills, penicillin, and hip replacements.
by Godel_unicode 9y ago
Off the top of my head; vaccines, vitamin pills, penicillin, and hip replacements.
- chiefalchemist 9y agoWell. I think hip replacements are not natural. The other three are just "man made" versions of things that readily exist(ed). But perhaps we have different definitions of natural :)