Video · Coming Soon: 12 Billion People on Earth TwitterShare on Facebook701 543 925 views SciShow - September 20, 2014 Science SciShow More Videos Hank Green Asks a Volcanologist Anything Science · 20 hours ago Why Do Things Keep Evolving Into Anteaters? Science · 2 days ago The Best Knife, According to Science Science · 3 days ago What Does Ketamine Actually Do? Science · 4 days ago You’re Washing Your Dishes Wrong Science · 5 days ago Scientists Can’t Agree On The First Ancient City Science · 1 week ago Why Everything Weighs Less in Antarctica Science · 1 week ago Why Can’t Every Flight Be Direct? Science · 2 weeks ago