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A Geology proffessor recently told me that around 200,000 years ago, when homo sapiens emerged, that "...all of civilisation can now fit on the width of a single strand of human hair."

I am perplexed! What did he mean by this?

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    $\begingroup$ Could be a comment on how short a time humans have been around geologically speaking. If you make a timeline of the 4.5 billion year history of the earth, and it’s like 5 feet long, 200,000 years is about one human hair width $\endgroup$
    – Ben51
    Feb 20, 2021 at 21:38
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    $\begingroup$ @Ben51 Ah yes, you must be absolutely correct. He was walking 100 meters with each step being 50 million years. Makes perfect sense. Thanks for the clarification! $\endgroup$
    – Jonathan
    Feb 20, 2021 at 21:43

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