(M)ost metals form an oxide layer when exposed to oxygen. Some are bad, but some "passivate" the surface, protecting it from corrosion (e.g., aluminum)
Small particles in a gas or liquid constantly (m)ove around randomly. Work on this "Brownian motion" led to the acceptance of atoms as physical reality
"If you're pre-born, you're fine; if you're preschool, you're fucked" – George Carlin, on a form of hypocrisy that's particularly relevant this week (M)
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