When speaking with hindsight, it's easy to make the mistake of conflating a point in time where an idea existed/was published (an easy fact to establish upper b

When speaking with hindsight, it's easy to make the mistake of conflating a point in time where an idea existed/was published (an easy fact to establish upper bounds on through records) with a point in time where that idea was popular and/or taken seriously (much harder to establish and usually localized).