Digits of pi: https://cloud.google.com/blog/products/compute/calculating-100-trillion-digits-of-pi-on-google-cloud https://cloud.google.com/blog/products/comput

Digits of pi: https://cloud.google.com/blog/products/compute/calculating-100-trillion-digits-of-pi-on-google-cloud https://cloud.google.com/blog/products/compute/calculating-1... It shows the boom from 1400. The boom is actually the rediscovery of methods that were discovered in India. Lead deposits in 1100 BC until 800: https://www.pnas.org/doi/10.1073/pnas.1721818115 https://www.pnas.org/doi/10.1073/pnas.1721818115 It shows the Roman Empire peak. Lead deposits in 0-1900: https://abload.de/img/8f70e5bd-bc6e-4756-8dbfzt.jpeg https://abload.de/img/8f70e5bd-bc6e-4756-8dbfzt.jpeg It shows the peak of the Roman Empire and the boom from the end of the 1400s on.