I'm guessing since the day they created the tools required to do so which is very recent, possibly in the 1980's+?
Not so long as humans are practicing medicine. (Mostly alone, and overworked.)
for as long as another real website says
Modern humans have been around for 200,000 years.
since the world started
as long as humans
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forever, no seriously, there has been slaves, and women have been below men for about as long as humans have been around.
drink bleach.
Humans have been on Earth for approximately 0.2% of Earth's history, which is estimated to be around 4.5 billion years. This means humans have been around for about 200,000 years.
Summer has been around as long as humans can remember, so nobody discovered it. As far as humans are concerned, it has always been there.
Slavery has been around as long as there have been humans.
since after the dinosaurs died out