[SauronOfMordor]

Geometry is crucial to land navigation. It's not surprising that hunters understand

[R. Scott]

"Many of its propositions -- that two points determine a line, or that three orthogonal axes localize a point -- are judged to be self-evident and yet have been questioned on the basis of logical argument, physical theory, or experiment," the researchers wrote.

There was no way the Munduruku could have learned these ideas, they added.

They are self evident to all but mathematicians! Even the most primitive tribesman knows that the shortest way to go from point A to point B is a straight line! Three axis defines a point – go east 100 paces, turn north go 50 paces. Climb up 4 body lengths. A point has been defined. What did they have to learn from a book?

[kinsman redeemer]

Eggs-actly.