Physics is consistent and predictable. If you launch a rocket *that way* and cut the engine, then it just keeps going *that way*. That’s super easy to model.
Biology is a hot mess. Yes, we know “how things work”…but if a thousand people bump their legs on the corner of the exact same table, while moving at the exact same pace, they’ll still all develop slightly different bruises. That’s *really hard* to model.
Latest Answers