Challenge 1: Detailed Speaker Notes Behind a Chart Slide — Solution Walkthrough

Steps:
  1. In Normal view, click into the Notes pane beneath the slide (or
     View > Notes).
  2. Type the detailed explanation of what the chart shows and what
     to say about it.

Who can see this text, and under what circumstances:

Only the presenter — visible in Presenter View during the actual live
presentation (on the presenter's own screen, never the audience's),
or if the notes are printed/exported separately as reference handouts
afterward. The audience, looking at the projected or shared screen
during the live talk, never sees this text at all — they only see the
chart itself, exactly as designed.

Why Speaker Notes was the right call, not visible bullet points:

Putting this same explanatory detail directly on the slide as bullet
points would recreate exactly the problem Chapter 9 warned about —
crowding a clean, single-chart slide with text the audience would
either read instead of listening to the presenter, or that would
visually compete with the chart itself for attention. Speaker Notes
gives the presenter every bit of that same detail, privately, with
zero cost to how clean and focused the actual visible slide remains
for the audience — the entire chapter's point that a slide's visible
content and a presenter's own supporting detail don't need to live in
the same place.

WHY THIS WORKS AS AN ANSWER
------------------------------
This is the direct, concrete resolution of the tension Chapter 9 set
up and explicitly left unresolved until this chapter: detailed
explanation is often genuinely necessary, it just belongs in Speaker
Notes rather than on the slide the audience actually sees.