Gamer Valentine's (m)essages: "If this were GTA, you'd get five stars because you're my most wanted". "*These* cakes aren't a lie". "Be mine" (think Yuri from RA2)
(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