i don't think such discoveries have all been found or will ever all be found. a nice recent one is finding rock concretions containing plastic. show that to anyone and they'll understand that plastic pollution is a problem. or fossils showing some dinosaurs had feathers. or the ancient remains of Lucy and other far ancestors showing humans evolved in east africa. or the measurements taken by hubble that proved the universe is expanding and that the milky way is just one of countless galaxies. they're obvious to us living now and if you showed them to people from not too long ago you'd blow their minds.