Today I will upload the steps of the NASA homework.

Step 1.Make lego towers out of. Legos. Make sure the first plate is 4 by 4.

STEP 2. Cut the cardboard in the length same as the length between 2 towers.

STEP 3. Get five balls and put a nail into the ball. (Caution. You might need help of an adult or else you might get injured severely or might just get hurt.

STEP 4. Get a fishing line and glue the line on the marble.. Make sure the string sticks on to the marble so that it doesn't fall when it is in motion!

 

 

STEP 5. Connect the balls after you had put some sticky material so that it wouldn't fall off. After that slide in the balls through the cardboard you have cut in STEP 2. Make sure the cardboard doesn't break. LOL. :D Then even it up!!

STEP 6?? Well this is it but here is the designing part. I just put guys fighting between the towers. Here is the photo. I call it the balls of death. 

I changed the bouncy balls to marbles cause bouncy ball did not work well as I expected.