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diff --git a/guide/challenge-bot-questions.org b/guide/challenge-bot-questions.org
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--- a/guide/challenge-bot-questions.org
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@@ -4,11 +4,29 @@
     these questions are about attaching the arduino to the deck.  you used
     a drill and drill bit to make holes for bolts to go through.  we
     drilled through the arduino into the deck.
-    0. [@0] what would happen if you used a larger drill bit than the one
+    1. what would happen if you used a larger drill bit than the one
        you used for drilling holes for the arduino?
-    1. why do people use drill bits that are smaller or the same size as
+    2. why do people use drill bits that are smaller or the same size as
        existing holes in circuit boards, like the blue arduino?
-    2. why did we use a drill bit that was wider than the body of the
+    3. why did we use a drill bit that was wider than the body of the
        bolt used to hold the arduino?
-    3. why did we drill through the arduino, rather than marking holes
+    4. why did we drill through the arduino, rather than marking holes
        and using the drill to make holes where the marks were?
+    5. how does the drill hold onto the drill bit?
+    6. what would happen if the drill bit teeth were not flat on the
+       drill bit?
+    7. name some reasons for the arduinos placement on the deck.
+       1. could it have been placed diagonally?  why or why not?
+       2. could it have been placed in any other location? why or why not?
+       3. could it be upside-down?  why or why not?
+    8. should we drill at full speed?  why or why not?
+    9. how can you break the drill bit when drilling?
+    10. the bolts used to attach the arduino are 6-32 bolts.  the bolts
+        used to attach the motor to the motor mount are 4-40 bolts.  Are
+        the 4-40 bolts fatter or thinner than the 6-32?
+    11. if you see a bolt described as =4-40x1.25=" how long is it?
+    12. on a =4-40= bolt, how many times does the thread wrap around
+        one inch of the body?  4 times?  40 times?
+        1. how many times does the thread of a =4-40= bolt wrap around
+           two inches of the body?  8 times? 40 times? 80 times?
+    13. what part of the screw does the screw driver go into?