When I was a young chemistry student, I learned that the atom was the smallest indivisible unit of matter. That was true—for a while. Then we learned about protons, neutrons, and electrons. Then we learned those weren't fundamental either; they could be divided into quarks and leptons.

For now.

Gravity was once a force that pulled objects toward the Earth. Then Einstein came along and said gravity wasn't really a force at all—it was the curvature of space-time.

For now.

Light was a wave. Then it was a particle. Then somehow it was both.

For now.

One of the things I've come to appreciate about science is that it doesn't claim to have all the answers. The best scientific ideas are simply the best explanations we have today—until something better comes along.

Every few years, something changes in running: training methods, recovery techniques, nutrition, strength training. When I was running in high school, strength training barely existed in the running world—maybe a few calf raises on the bleachers. Today, it's one of the most researched and widely recommended tools for improving performance, durability, and longevity.

Will every recommendation we follow today survive the next twenty years? Probably not. And I think that's okay.

Science isn't supposed to stand still. Neither are we. The goal isn't to have all the answers; the goal is to stay curious enough to keep learning.

For now.