This TikToker made an ecosystem jar four years ago. When she finally saw it again, she was surprised to see what was growing—or rather, moving around—in it. What’s in the jar? In a wildly viral video ...

Years ago, this TikToker did an experiment where he put some water and other things in a jar and sealed it up to see what would happen. Well, it has been a while, and he came back to check it and ...