Dr Carl Sagan Quotes
True human progress, that which can be linked to evolution, and which prolongs it, can only consist in perfecting and ameliorating man himself and not in improving the tools he employs, nor in increasing his physical well-being. 
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Mankind | | True | Human | Progress |
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In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken', and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen.
- Dr Carl Sagan
