Hydraulic Gearbot | Pathfinders ­ With the push of a syringe you set a range of gears into action! a rack and pinion gear - rotational motion to linear motion . . . Hydraulic Gearbots are not all that common, but the fun thing about this one is that it is relatively easy to make, will amaze your friends, and you can toss popcorn around when your parents are not home (if you are a parent don’t read that last sentence). Also, your gearbot will be able to launch marshmallows at friends for fun and profit (OK, maybe not profit). There is information about the different gears at the end, and if you read it our researchers said you could be 42% smarter! Now Here!- and it was awarded “ 2016 Toy of the Year “- for building kits by Creative Child Magazine! Learn about hydraulics - and then launch things - all using gears and levers and more ! Duck is not supplied !