The four horsemen of lab hygiene, everyone. Chemists washing hands before touching anything is pure self-preservation—those compounds don't care about your skin's pH preferences. Meanwhile, physicists are too busy contemplating whether hand-washing exists in all parallel universes to actually do it. Biologists know exactly what microscopic horror show lives on bathroom surfaces. They've seen those cultures. Normal people think explaining their hand-washing habits is reasonable, unaware they've just triggered four different scientific threat assessments simultaneously.
The Four Horsemen Of Laboratory Hygiene

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