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Here's an example to demonstrate the length of time that human beings have existed when compared to the time from Earth's formation:

Observe the length of your arm from your shoulder to your fingertips. This will represent geologic time; the time from the formation of the Earth. Run a fingernail file across the end of the fingernail of your longest finger. You have just erased the period of time in which Homo sapiens has existed.

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15y ago

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