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Anne Horvatic PHOTOGRAPHS axle berries into flour bicycle bike bottom brake called chain climb closer cork crushing wheels curb door dowel dragged drill E. P. DUTTON easier easily farther faster finger flat force pulls friend to hold fulcrum grain grinder grind hammer happens hard harder help us move hole inclined plane kinds of simple less friction levers need LIBRARY load Look move things nail paint park pedals PHOTOGRAPHS BY Stephen picture piece of wood push or pull rain and snow ramp to walk ridges rolling roof rooftops round rubbing Scientists screw and nut screw hold screwdriver seesaw simple machines someone Sometimes a wedge spiral slide split STEPHEN BRUNER Steps stick straight Think thread path tightly tilted surface wagon is pulled wedge uses force wheat berries wheel becomes wheel turns wheelbarrow wheels help wheels move wood chips