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Hi, I don't understand what the underlined part...
What does that mean in this context? Thank you.
Darwinian ideas are thus by no means necessarily optimistic. But those
who accepted them for the most part found them full of hope. They
seemed to make it quite clear that what is called progress is just as real
as what is called gravity. They gave the sanction of natural science
to moral and political ideas, much as Newton's ideas had done a century
and a half earlier.