Squeeze the history of the Earth into a single day. How many seconds before midnight do modern humans appear?

How close can you get? Make your own guess and earn points before you look at the answer.

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Show the answer and the reasoning

The answer

5.7 seconds

Less than 6 seconds before midnight.

How to get there

1. 300,000 ÷ 4.54 billion = 0.0066% of Earth history
2. 86,400 seconds × 0.000066 = 5.7

Source: Calculation

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