How we (Robyn is my partner) made our strong structure 
is we made lots of pillars and after that we taped them
 together and formed them into a box shape. We made three
  boxes and taped them on top of each other and put an x
  in the middle of the second floor. After we put
that together Robyn made a roof. It was pointy and long
 and we also put
double layers on some of the index cards. After Mrs.
 Hester helped us
weigh our structure and it weighed 60grams. 
Then we started to hang washers in the middle card 
that was going across the structure. First we put 10
 washers on the structure and then Robyn kept adding
  washers and then it started to wobble. We tried putting
   the washers on the opposite side of where the wobbling 
   was but it didn't work so we just stopped. In total the
    washers weighed 460 grams in all. I learned that it
	 doesn't matter how high it is because the smaller
	  structures held the most.