Ask the same engineering question twice.
A control-stability question where eyeballing fails — every coefficient is positive, so it looks stable. It isn't.
The question
Is the closed-loop system with characteristic polynomial s⁴ + 2s³ + 2s² + 8s + 5 stable? Give yes/no and the margin.
Guided starts
One-click entry points into the deterministic engineering screens. Click a card to copy its prompt. Cards with “Use sample data” attach a synthetic sample file and run the screen end-to-end in a new analysis.