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Imagine being able to see the entire history of humanity in just one second. Well, from the first steps out of the water to the first steps on the moon, that’s how long we’ve lived in cosmic terms. But in that short time, we’ve done a lot. What would you see if you traveled back a billion years? Would the Earth look like a giant snowball? How far back in time would you have to travel to see the first humans? And are we headed for extinction? What If in other places: What If in English: http://bit.ly/facebook-whatif What If in Spanish: http://bit.ly/YT-Spanish-what-if What If in Italian: http://bit.ly/Cosa-succederebbe-se What If in French: http://bit.ly/Et-si-youtube What If in Mandarin: http://bit.ly/YT-Chinese-what-if What If in Hindi: http://bit.ly/what-if-hindi-youtube Podcast: http://bit.ly/yt-what-if-show-podcast What If is a documentary miniseries that takes you on an epic journey of hypothetical worlds and possibilities. Come with us on an imaginary adventure through time, space and chance. We'll do our best to explain complex topics in a fun way. Produced with love by Underknown in Toronto: https://underknown.com