"Question whether foundational terminology is exactly backwards Aerospace-informed analysis reveals that in disc golf, the terms "overstable" and "understable" are aerodynamically inverted from what they should mean: a disc called "overstable" is actually the more aerodynamically unstable object, and the disc handed to beginners — called "understable" — is actually the more aerodynamically stable one. Destin Sandlin concludes, "I think these words are exactly wrong, not only from an aerodynamics perspective, but from a let's go play disc golf perspective." In any field you enter — medicine, finance, engineering, law — treat inherited jargon as a hypothesis, not a given, because the vocabulary sometimes encodes a historical error that shapes how everyone thinks. Source: Destin Sandlin, Smarter Every Day, Why Does a Disc Golf Disc Curve?"