> 25 × 10^6 is, roughly, what separates us from orangutans: 12 million years to our common ancestor on the phylogenetic tree and then 12 million years back by a

> 25 × 10^6 is, roughly, what separates us from orangutans: 12 million years to our common ancestor on the phylogenetic tree and then 12 million years back by another branch of the tree to the present day orangutans. > But are there topologists among orangutans? > Yes, there definitely are: many orangutans are good at ”proving” the triviality of elaborate knots, e.g. they fast master the art of untying boats from their mooring when they fancy taking rides downstream in a river, much to the annoyance of people making these knots with a different purpose in mind. https://www.ihes.fr/~gromov/wp-content/uploads/2018/08/manifolds-Poincare.pdf https://www.ihes.fr/~gromov/wp-content/uploads/2018/08/manif... Whenever anyone refers to another sentient being as stupid, the assessment tends to say more about the speaker.