The constantly changing tide of human advancement.
6m2015
6.2·1995
6.2·2013
6.2·2023
6.0·2022
6.2·2020
6.4·2024
6.3·1990
6.2·2006
7.4·2017
6.1·2013
7.1·1954
6.3·2015
6.4·2020
5.8·2025
7.4·1994
6.7·2011
6.3·1956
7.1·2018
6.0·2018
6.7·2019
