the.com/trivial
The thing so small it didn't even merit a footnote — until someone bet on it.
means Of so little importance that it barely deserves attention or effort.
from From Latin trivium, the place where three roads meet — a public crossing where ordinary people swapped commonplace gossip, hence the unremarkable and everyday.
School rootsThe medieval trivium taught grammar, logic, rhetoric — the basics.
Math twistMathematicians use it for the obvious-yet-correct case.
PursuitTrivia became a hobby precisely by valuing the worthless.