What Is Inertia?

It's important to remember that we can't solve these problems all at once. The way the process works is somebody has an idea which sort of takes you in a certain direction and maybe doesn't work. And five years later, somebody comes up with another idea that maybe solves a problem and makes it work or brings you closer. We can keep a theory around even if it's not quite working yet because it might potentially come together later. I see. So like the specific ideation or instance of it right now doesn't seem to quite work. But it's still an interesting idea to think that maybe what we think is stuff like dark matter or maybe the way we can explain things like inertia