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diff --git a/guide/challenge-bot-questions.org b/guide/challenge-bot-questions.org
index c7ce82a..36c7f8e 100644
--- a/guide/challenge-bot-questions.org
+++ b/guide/challenge-bot-questions.org
@@ -1,14 +1,92 @@
+#+OPTIONS: toc:nil
 * challenge-bot questions
 ** mechanical questions
 *** arduino to deck
-    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
-       you used for drilling holes for the arduino?
-    1. why do people use drill bits that are smaller or the same size as
-       existing holes in circuit boards, like the blue arduino?
+    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.
+    1. what would happen if you used a larger drill bit than the one
+      you used when drilling holes through the arduino?
     2. 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
+    3. why do people use drill bits that are smaller or the same size as
+       existing holes in circuit boards, like the holes in the blue
+       arduino?
+    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. how can you break the drill bit when drilling?
+    8. should we drill at full speed?
+       why or why not?
+    9. 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?
+*** motor
+    these questions are about attaching the motor to the deck.
+    to attach the motor to the deck, first we attached motor mounts.
+    the motor mounts are the square things with 6 holes of
+    various sizes.
+    1. 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?
+    2. if you see a bolt described as =4-40x1.25=" how long is it?
+    3. 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?
+    4. what part of the screw does the screw driver go into?
+    5. why are the motors between the wheels?
+    6. why do we wrap tape around the body of the motors?
+    7. why are the motors pointed towards the caster in the back?
+    8. why do we put a zip tie around the motor?
+*** breadboard
+    the breadboard is the white thing in the middle of the deck.
+    it has a black thing plugged into it.
+    almost everything with wires plugs into the breadboard.
+    1. where is the breadboard?
+    2. what's the difference between stranded and solid core wire?
+    3. why are we using solid core wire for plugging into
+       the breadboard?
+    4. do we have the black chip (motor controller) be on the left or
+       the right of the breadboard?
+    5. why should the chip be on the right on our robot?
+*** batteries
+    there are two battery packs on the robot.
+    one of them powers the motors, and is in the clear battery pack.
+    the black battery pack powers the arduino.
+    1. why are the battery packs between the wheels and caster
+       (roughly)?
+    2. should you pick up a battery by the wires coming out of it?
+    3. what are the wires coming out of the battery called?
+    4. why do we put the glue dots on the side of the battery pack
+       without the on/off switch?
+*** caster
+    the caster is the solid metal sphere.
+    it is held in a 3d printed plastic housing called the caster standoff.
+    the standoff is fixed to the deck with 3 nuts and bolts.
+    1. where is the caster?
+    2. why is the caster in the middle of the back, instead of on the
+       left or right?
+    3. what would happen if there were no caster on the back
+       of the robot?
+*** tools
+    1. do you have a ratcheting socket wrench?
+       what is a ratcheting socket wrench?
+    2. what is the socket wrench used on?
+    3. what are the pliers?
+    4. what do you use to take the colored part off the end of a wire?
+*** misc
+    1. what is the robot tread made out of?
+    2. why is it difficult to push the sonar into the sonar holder?
+    3. what would happen if the sonar were easy to push into the sonar
+       holder?