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- when everything in the universe began
- paved way for new thresholds of increasing complexity (couldn't put 13.8 bya)
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- when everything in the universe began
- paved way for new thresholds of increasing complexity (couldn't put 13.8 bya)
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- the first ever human beings to arrive on Earth (couldn't put 5-7 mya)
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- first human beings on Earth (couldn't put 5-7 mya)