How have thou thee thy thine evolve to you your in English?

I can give you a little bit of the history:

In Shakespeare's time, thee/thou/thy/thine AND you/your were used.

You/Your for formal address* and also for plural (if talking to more than one person).

Thou/Thee/Thy for informal address, for when you're talking to one person that you know, love, or look down on.

Then I guess people just gradually stopped making that distinction, and decided they'd be polite to everyone, thereby depriving the formal address of its formality.

*if want more specific information on formal versus informal address, look up information about the Spanish "tu" and "usted", or the French "tu" or "vous".

answer #2If scientists, and their theories, had not captured the minds of humans. They might have taught evolution, instead of moronic Darwinism.

-ism: doctrine, system of beliefs [-ismos to separate motions< cosmos, to cause motions]

The evolution of living languages, through human carelessness with Words, is the cause of all evolution.