quoteinvestigator.com
Quote Investigator
https://quoteinvestigator.com › 2018 › 12 › 25 › universe
quoteinvestigator.com
Quote Investigator
https://quoteinvestigator.com › 2018 › 12 › 25 › universe
en.wikiquote.org
en.wikiquote.org
https://en.wikiquote.org › wiki › J._B._S._Haldane
en.wikipedia.org
oxfordreference.com
libquotes.com
libquotes.com
goodreads.com
goodreads.com
classyquote.com
classyquote.com
https://classyquote.com › quotes › j.b.s.-haldane-9045
practopian.org
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