Loads of things.
DNA profiling, the worlds first jet airliner, HTML, Graphene, theory of the Higgs Boson, if you go back a few years further the first computer inspired by Alan Turning.
I'd go with mobile phones personally opened up my world for sure! When I was kid the only phones were the ones in the red boxes with push button b! They have come so so far! I can WhatsApp vid chat daughter in florida for free! It's amazing!