Materials Three clear plastic
cups Water
Measuring cup Rocks that can be sorted into one
of three size groups (ideally all
of the same
type of rock, such as granite) Screen (optional) Preparation Make sure that the rocks are sorted into three different groups by size.
Almanac * • Apple • Art File * • Astrolabe • Backscratcher • Ball * • Bamboo * • Beret • Bill Blaster • Book * • Book
of Marco Polo • Bosun's Pipe • Bow * • Bowser Statue • Bread • Bucket
of Plaster • Buckle * • Bug Fix * • Bug Report * • Bunny * • Calculus Book • Cat • Chisel • Chocolate * • Cloth * • Compass * • Conversations on Chemistry * • Crank Handle * • Crown •
Cup of Tea • Declaration
of Independence • Dictionary * • Dinosaur Egg † • Drawing
of Air Screw • Drawing
of Ideal Man • Drumstick • F = MA • Fan • Feather • Filament • Firecracker * • Fireworks • Flag (India) • Flag (United States
of America) † • Flask * • Floppy Disk * • Flute * • Football • Globe • Grape • Handkerchief • Hand Mirror • Horse's Bit • Hourglass Block † • Ice Cream * • Incense • Inkwell * • Key (Mainz) • Key (Philadelphia) * • Knife • Ladder • Laurel Wreath • Law Book • Lemonade * • Lens • Light Bulb † • Magnet * •
Measuring Stick • Message Block • Metal
Type • Metronome • Milk * • Mona's Mirror • Mona Lisa • Money * • Monocle • Mushroom • Music • Newspaper • Notebook • Onion • Paint • Paintbrush • Painting * • Pamphlet • Paper Money • Penny * • Physics Equation † • Poetry Book * • Postcard • Principia • Print Block • Propeller † • Quill Pen (1602) † • Quill Pen (Orleans) • Rat Trap • Republic • Rice * • Pearl Necklace • Scarf * • Scissors • Script * • Scroll * • Shield • Skull • Sledgehammer † • Spectacles (Philadelphia) • Spectacles (Washington, D.C.) * • Staff • Stamp * • Starman † • Steering Wheel † • Stovepipe Hat † • Sword † • Tea Bag • Telegram • Telescope (Padua) * • Telescope (Trinidad) • Throne † • Ticket * • Timulator • Tire * • Torch † • Toy * • Turkey * • Watch * • Warp Pipe † • Whirlpool • Wooden Snake