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No, they don't. I didn't know anything about stereo vision when I was young, yet I had depth perception. I didn't know about how my heart worked, yet blood pumped around. I learned to walk without knowing how my brain used visual and information from my inner ear to let me balance. The same way I stand upright, birds fly. They don't necessarily have to *know* about the principals to know how to do it. Birds do know how to fly (most do) yet they don't understand principals of air pressure and lift. Mark Sottilaro Tim Nelson wrote: > > --- jim palmer <jimp@pobox.com> wrote: > > sparrows clearly know something of aerodynamics. > > Are these fully-laden African or European sparrows? > :^) > > Back to the OT, I ran across this the other day: > <http://www.webster.sk.ca/greenwich/fl-compl.htm> > > Looks like a mathematical relationship between notes > has been around for a while! > > -t- > > __________________________________________________ > Do you Yahoo!? > Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > http://mailplus.yahoo.com