It is on a shelf above the computer desk. You need the key (from the aquarium) and the torn page (from the trash can in the kitchen).
MrSilva has the shrink ray he is the one who stole it and shrinks you
Have fun
open the diary the you can find over the computer.
Get on the mini hot air balloon in the far part of CJ's room
you have to turn it on so the heater in cjs room turns on, blows you on her bed and you get across the fan.
you put it in cj's diary in her room
go to teliscope
in the science fair in the school building with his wife or Cj's mom in the science fair room
the key is inside the one to the diary
You put the torn page with it.
You just get it above (on the shelf,above) CJ's laptop computer
go to CJ's room and put it in her diary above her computer