Gas Laws Manipulative - something I learned from another AP chemistry teacher years ago. Continuing the tradition of instructional sharing - I passed on the trick to a group of chemistry teachers today. Cover the variable that is constant (in the problem)
This place has some great science and history ideas for the third grade. These could be edited to work with a higher or lower grade. Third Grade Thinkers: Science: Earth Cycles Need to make sure its accurate to prevent misconceptions!
questioning strategy: This would be a neat display to have in the classroom to encourage students to ask questions about things they are curious about. Asking lots of questions helps students clarify their thoughts.
British Columbia Grade 3 Math I use this project when I start my multiplication unit to teach repeated addition, groups of, commutative property, and arrays. You could also replace one with a multiplication word problem and picture.
Ginger Snaps Treats for Teachers ~ a landform flip book that starts out as individual forms but then when it comes together it builds an entire scene of a physical environment incorporating all different landforms.