Sometimes, there is an absolute limit on the number of terms an officeholder can serve, while, in other cases, the restrictions are merely on the number of consecutive terms.
For example, Maxwell's Equations would always be capitalized, while quantum mechanics is usually un-capitalized. I searched half a dozen sites for an answer to this but found no clue about a rule. So go either way that makes you happy, but (most of all) be consistent.
Did Quantum Mechanics really have an impact on science, or is it just over-blown? Did the new ideas that were introduced actually change the way we do science or think about stuff (especially with atoms), or is it really not used that much?