Summer vacation used to mean two months of freedom: pools, playgrounds, and hours spent hanging out with your friends.But for Gen Alpha and the youngest members of Gen Z, summer is starting to look a little different.Changing technology, safety standards, more cautious parents, and social media have all changed how summer looks. Imagine explaining a unicorn pool float to a Victorian child — it’d send them into a tailspin.These photos show how summer vacation has changed over the last century.