What are the chances of YOU existing? A biologist explains | Sean B. Carroll

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Humanity has two giant collisions to thank for its existence, explains biologist Sean B. Carroll.

When an asteroid landed on the Yucatan peninsula 66 million years ago, it turned our planet into a debris field of chemicals that, eventually, fostered human life. Sean B. Carroll, author and esteemed biologist, unpacks the consequences of this collision, and claims we, as a species, should feel fortunate that we’re on this planet at all.

This historical cosmic event, paired with the tectonic movement of Earth’s plates and the initiation of the Ice Age, ultimately led to existence as we know it today. Without these random, chance environmental and biological encounters, the development of life would have been stunted, or even entirely nonexistent.

Even the sequence of human conception is random and unlikely, Carroll explains, leading us to reevaluate our understanding of evolution, true survival, and the significance of each individual life.

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