Comment in a letter from Konstantin Tsiolkovsky from 1911: "Planyeta yest' kolybyel razuma, no nyelzya vyechno zhit' v kolybyeli" ("The planet is the cradle of the mind, but you cannot live in the cradle forever" >> "Earth is the cradle of humanity, but one cannot live in a cradle forever [The solar system becomes our kindergarten]")

**** sapiens has been around for 300,000 years

Collection "Human excess"