Materials List: Just Like Kidneys:
Semipermeable Membrane Prototypes

Each group needs:

To share with the entire class:

  • an assortment of possible prototype-building materials, from which each group chooses three; suggested materials: sugar cubes, newspaper, copy paper, magazine paper, cardboard, paper plates, paper towel squares, cotton fabric squares (~1-foot square); consider sourcing many items from recycling bins (paper, newspaper, magazine paper, cardboard); consider getting fabric scraps donated from quilters, sewers, parents, or buy from fabric store bargain bin
  • assorted tools for construction/fabrication: scissors, craft knives, tape, cotton string (2-foot lengths)
  • items for testing permeability: tap water, liquid food coloring