Variable names are a notational convenience.
As such, one should be able to explore variable names recursively.
For example, in the formula:
y = mx + b
what is "m" and what is "b"?
If we rewrite the formula as:
y = slope * x + intercept
the equation becomes less readable (at least, for "experts").
Our editors should allow us to explore — expand — variable names.
For example, in the above formula, we should be able to click on "m" and ask for a lengthier name.
From there, we should be able to push down and get even more detail, e.g. an explanation of the term "slope".
m —> slope —> description of slope —> etc.
Tooltips, as they currently exist — hover over an item to get a longer phrase — are not "enough".
We need tooltips for tooltips.
We need tooltips for tooltips for tooltips for …