All categoriesEngineeringGovernanceScience Today 2021 2020 2019 2018 2016 2015 2013 2012 2011 2010 2000 1990 1980 1970 1960 1950 (-) 1940 Facet Date 2025 Today You are here! 1940 1940s Engineering Left over radar equipment used to jump start radio astronomy