the future 100 years ago. netpipe January 8, 2019 6 billion people multiplied by 100 = 600,000,000,000 years of human advancement https://www.dailymail.co.uk/news/article-2920453/Laughing-face-death-Incredible-pictures-construction-workers-fooling-built-America-s-iconic-buildings.html 1920’s
