Here's a simple example, showing how "doesn't react with" doesn't imply "doesn't interact with": CO poisoning. In the normal course of things, hemoglobin in our

Here's a simple example, showing how "doesn't react with" doesn't imply "doesn't interact with": CO poisoning. In the normal course of things, hemoglobin in our blood binds O2 in our lungs, and releases it downstream. But if we breath CO, it also binds to hemoglobin. Very tightly. A lot more tightly than O2 does. So eventually, there's too little free hemoglobin for carrying O2. And we die.