Chemistry students asking why their professor wears a mask is peak academic innocence. Little do they know that behind every scientific discipline is a chaotic mess of "weird rules and exceptions" that would make your brain melt.
Chemistry is just the gateway drug. Once you peek behind quantum physics, you'll understand why some professors develop that thousand-yard stare. Trust me, there's a reason we keep certain knowledge locked away—your sanity depends on it.
Twenty years into teaching and I'm still putting on the mask before explaining orbital hybridization. It's not to protect me from chemicals—it's to protect students from seeing my soul leave my body.