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Carl Sagan - Suppose your father... walked into this...
Suppose your father... walked into this room at the ordinary human pace of walking. And suppose just behind him was his father. How long would we have to wait before the ancestor who enters the now-open door is a creature who normally walked on all fours? The answer is a week. (Carl Sagan)

Suppose your father... walked into this room at the ordinary human pace of walking. And suppose just behind him was his father. How long would we have to wait before the ancestor who enters the now-open door is a creature who normally walked on all fours? The answer is a week.

Carl Sagan

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ancestor answer behind creature door father human ordinary pace room suppose wait walking week fours

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