# Research log entry

**Date:** YYYY-MM-DD
**Paper:** P1 (MER 2.0) | P2 (Matrices→Networks) | P3 (AI Tutor) | Lab
**Time spent:** Xh Xm

## What moved
One sentence. Concrete. A number if at all possible.

> Example: "Bench-tested 3 spring stiffnesses against the 2-mass eigenvalue prediction; k = 12 N/m gives RMSE 4.7% on the lower mode."

## What surprised me
Optional. The thing that did not match prediction. The shape of the surprise is where the next experiment lives.

## What's next (one step)
The single smallest action that moves this forward. If you can't name it, you don't yet know what you're doing — go for a walk and come back.

## Open question for Jeff
Optional. Only fill in if you have actually exhausted what you can figure out yourself. Drafts and proposed answers > open-ended questions.

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*Tag conventions: `#hardware` `#code` `#math` `#pilot` `#draft` `#irb` `#video` `#blocked`*