The Mind of Aristotle--

https://en.wikipedia.org/wiki/Aristotle#:~:text=Aristotle%20left%20his%20works%20to%20Theophrastus%2C%20his,of%20Athens%2C%20Alexandria%2C%20and%20later%20in%20Rome.

Including his identification of the sex organ of an octopus, his observations of smoke and fire, the ground level before a volcanic eruption etc,

He also told Alexander about the "Palisades" --the Himalayas--and his pupil reach the Indus Valley before his soldiers refused to go any further.