Agriculture advancements have changed the world, from writing papers in 7th grade about the starvation of Africa and Ethiopia to you barely hear this anymore outside of war zones. Fertilizer improvements. pesticides and genetical improved seed combined with Harvesters ect has revolutionized the food industry. Next is a tie between Pron and Avocado Toast followed by Tinder, I cant believe Tinder isnt worth more than Google and Amazon combined.
If the Webb telescope works as planned (so far so good) it will be top ten all time greatest human tool.