Things change over time. Not only simple things like music, trends, fashion, and technology, but knowledge and science evolve, too. Over time, people have come to learn more about science, safety, and the world in general. There are quite a number of ideas and items in the past that, looking back on them now, seem pretty crazy for someone to have come up with. Whether it's a new social norm or a scientific breakthrough, things have changed a lot.

To be fair, in even just 20 or 30 years, people in the future will probably look back on current times and think some of the things people do today are crazy. Time is an odd concept, and practices are changing constantly. Things should keep improving over time, but there is no saying for sure. The world is a weird place.

Everything that existed back then remains online, though, which means the world will never forget what people thought was acceptable in the past. Here are 24 images of things people did back in the day that seem a little odd now.