3
votes
1answer
729 views

What are the colors of the rainbow?

While the colors of the rainbow (or spectral colors) form a continuum, people have assigned them to finitely many pigeonholes for centuries and probably millennia. Apparently, Newton used seven colors ...
10
votes
6answers
264 views

Does the colouring of animals depend on what the mother sees before conception?

What is the meaning of the hishtadlus that Yaakov made with the conception of the animals starting at 30 (37)? Is it or was it a natural thing that the colouring of animals depends on what their ...