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Logic of possibility (view source)
Revision as of 22:19, November 27, 2015
, 22:19, November 27, 2015Darwin: Bear into Whale
|quote=The importance of the asserted identity of the two masses was stressed by Einstein in unambiguous terms: ''The possibility of explaining the numerical equality of inertia and gravitation by the unity of their nature gives to the general theory of relativity, according to my conviction, such a superiority over the conceptions of classical mechanics, that all the difficulties encountered must be considered as small in comparison with this progress.''}}</ref>{{#tag:ref|cf. ''Dirac once said, "That which is not observable does not exist," but these days what is said is, "I know my theory is right. Therefore anything required to make it work must also be right whether observable or not."''<ref name="DismantlingBB">{{cite book|author=Alex Williams, John Hartnett|title=Dismantling the Big Bang|publisher=Master Books|location=Green Forest, AR, USA|year=2005|pages=288|isbn=978-0-89051-437-5 |url=http://books.google.com/books?id=EvN9Gfbox74C&printsec=frontcover&dq=dismantling+the+big+bang&hl=sk&sa=X&ei=uE2VUtadEYrMygOThYDABQ&redir_esc=y#v=onepage&q=Dirac&f=false}}</ref>|group=note}}
|quote=The importance of the asserted identity of the two masses was stressed by Einstein in unambiguous terms: ''The possibility of explaining the numerical equality of inertia and gravitation by the unity of their nature gives to the general theory of relativity, according to my conviction, such a superiority over the conceptions of classical mechanics, that all the difficulties encountered must be considered as small in comparison with this progress.''}}</ref>{{#tag:ref|cf. ''Dirac once said, "That which is not observable does not exist," but these days what is said is, "I know my theory is right. Therefore anything required to make it work must also be right whether observable or not."''<ref name="DismantlingBB">{{cite book|author=Alex Williams, John Hartnett|title=Dismantling the Big Bang|publisher=Master Books|location=Green Forest, AR, USA|year=2005|pages=288|isbn=978-0-89051-437-5 |url=http://books.google.com/books?id=EvN9Gfbox74C&printsec=frontcover&dq=dismantling+the+big+bang&hl=sk&sa=X&ei=uE2VUtadEYrMygOThYDABQ&redir_esc=y#v=onepage&q=Dirac&f=false}}</ref>|group=note}}
==Notable Examples==
===Darwin Saw the Whale in the Black Bear===
In the first edition of his book ''[[The Origin of Species by Means of Natural Selection]]'', Darwin claimed that he "can see no difficulty" in race of [[bear]]s enlarging their mouths by eating insects while swiming in the water thus gradually changing into [[whale]]s:
<em>"In North America the black bear was seen . . . swimming for hours with widely open mouth, thus catching, like a whale, insects in the water. Even in so extreme a case as this, if the supply of insects were constant, and if better adapted competitors did not already exist in the country, I can see no difficulty in a race of bears being rendered, by natural selection, more and more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as a whale."</em><ref>{{cite web |title=Darwin Saw the Whale in the Black Bear |author=John L. Gittleman |publisher=The New York Times Company |date=16 May 1994 |url=http://www.nytimes.com/1994/05/16/opinion/l-darwin-saw-the-whale-in-the-black-bear-097454.html |accessdate=27 November 2015 |quote=...Darwin omitted this story in other editions, but regretted his revision."I still maintain that there is no special difficulty in a bear's mouth being enlarged to any degree useful to its changing habits" ("More Letters of Charles Darwin," 1903, page 162). JOHN L. GITTLEMAN Associate Professor of Zoology, University of Tennessee Knoxville, Tenn., May 3, 1994}}</ref>
== Notes ==
== Notes ==
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