1939 introductions

thumb|Animatronic figure of Chuck E. Cheese (character)|Charles Entertainment Cheese in operation at a [[Chuck E. Cheese location in Laguna Hills, California (September 14, 2017)]] thumb|An animatronic Tyrannosaurus at London's Natural History Museum

full body exercise based on squat thrusts, providing cardio and strength training

state leading to a Pareto-efficient outcome, concerning the compensation principle

group the modern Indo-European languages of Europe with shared common features

color used on North American school buses

thumb|right|TV receiver E1 (1939)