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20 yards Action experiment adhesive underneath air resistance apple ball balloon bend better than wheels blows bowl brick carton cheetah crawl crawler curve Cut a boat distance ever walked distance of 20 ENERGY SPIDERS experiment shows fast faster fastest known thing feathers feet fingers fish have slim flap flippers float Flying fish Fold force trying forward frog gannet gently glide ground hairpin hang glider helicopter Hold hovercraft Hoverers inches Jet boats jump kangaroos land lean leaps long matchstick longest skid mark Loop the elastic lot of energy marble move muscle power number of strides Oak-bush cricket paddle paper pencils Pop-eyed squid push a nail push against stones react to danger rotor sand side skimmer skimming snake spin Sprinters squash stops suddenly straight line stretch strides you take string sucking in water surface skin swim tail Tape tendons trajectory whirl yards 16m yards 20m yards or 20m