GROOT

Groot descends from an ancient, ennobled sap-line on Planet X, scion of an elite royal house of Flora colossi, and his upbringing matched the pedigree. The Arbor Masters who rule his people teach their young through Photonic Knowledge — the accumulated learning of generations, absorbed directly through photosynthesis — an education Marvel's records rate as genius-level.

His specialty is named outright in those records: a tremendous grasp of quasi-dimensional super-positional engineering. The strongest on-panel witness is an unlikely one — Maximus the Mad, who insisted in the Guardians' orbit that Groot's every utterance carries dense, fully formed meaning for anyone who learns to parse its pitch and cadence, the testimony of a fellow genius translating a colleague nobody else can follow.

The joke lands because the credential is real and useless in the field. Groot's schooling never surfaces as blueprints or machinery on the page; it hides behind three audible words, while the raccoon who understands him best treats the professor as muscle and rides him into battle like artillery.