There is much that science doesn't understand, many mysteries still to be resolved. In a Universe tens of billions of light-years across and some ten or fifteen billion years old, this may be the case forever. We are constantly stumbling on new surprises

Carl Sagan
About This Quote

We are constantly stumbling on new surprises and we can never know all there is to know about things. We might not understand the world we live in even after we have learned everything we can about it.

Source: The Demonhaunted World: Science As A Candle In The Dark

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