Molecular Matchmaking
This universal prefix rule is why we do not use prefixes like "mono-" on the very first element name of a covalent molecule.
What is the rule that a single first element is implied to be one without a prefix?
The unique term for the downward motion of an object when it is falling solely under the influence of gravity with zero air resistance.
What is free fall?
This fundamental universal force is responsible for holding the nuclei of atoms together and is the strongest force in existence.
What is the strong nuclear force?
This wave phenomenon is why an emergency siren sounds like its pitch is steadily dropping as you accelerate away from it in a car.
What is the Doppler Effect?