[RightWhale]

what caused the apple hit Newton's noodle?

It's the intersection of unrestrained spatio-temporal geodesic lines, which are perfectly straight in generalized Hamiltonian continuum coordinates.

[DannyTN]

"It's the intersection of unrestrained spatio-temporal geodesic lines, which are perfectly straight in generalized Hamiltonian continuum coordinates. "

That's going to take a little while to digest.