add check for how to insert drill bit

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index 72de0cff48333284c86fa70aa1880daedf92f4c5..d5fcaf2c9d2c6245a3e05357153aa6a64f538598 100644 (file)
--- a/curriculum/challenge-bot.scm
+++ b/curriculum/challenge-bot.scm
@@ -70,7 +70,14 @@
         [while holding the drill bit, twist end of the drill to tighten
                the teeth.
                make sure that the teeth end up gripping the flat part of
-               the drill bit.]))
+               the drill bit.])
+     (p [check
+         ,(itemize
+           (item
+            [where should the teeth clamp down on the drill bit?])
+           (item
+            [what would happen if the teeth tightened on the recessed
+                  part of the drill bit?]))]))
     (subsubsection
      :title [holding drill]
      (p [hold the drill with one hand on the handle and trigger.