Re: [Phys-l] Tutoring Please

[Bernard Cleyet <bernardcleyet@redshift.com>]

and why did it take 9 => 10 cent. for the horse collar to end the feudal 
system in Europe?


http://en.wikipedia.org/wiki/Horse_collar

bc

p.s. one of Garrett Hardin's ancestors invented a pneumatic horse collar 
(ca 1900) just too late to make any money from it.


Jack Uretsky wrote:

> Hi Jim-
> 	Your question seems to be, broadly speaking, what is the nature of 
> knowledge?
> 	Thales, Anaximenes, and Anaximander (all at Miletus) tried to 
> postulate a minimum of universal substances from which all matter was 
> composed.  The first two respectively named water and air as the 
> primordial substance, Anaximander said that the primordial substance was 
> unnameable (all this as reported by Aristotle).  Fire was added by 
> Heracleitus.  Empedocles added earth, but he was already asking a 
cut