![](/nationalgeographic/pathfinder_september_2018/wedge_it/189656/zipper.720_0_1.png)
![](/nationalgeographic/pathfinder_september_2018/wedge_it/189666/chisel.400_0_1.png)
![](/nationalgeographic/pathfinder_september_2018/wedge_it/189651/fork.128_0_1.png)
![](/nationalgeographic/pathfinder_september_2018/wedge_it/189653/pin_yellow.128_0_1.png)
![](/nationalgeographic/pathfinder_september_2018/wedge_it/189657/pin_blue.128_0_1.png)
![](/nationalgeographic/pathfinder_september_2018/wedge_it/189654/shovel.640_0_1.png)
![](/nationalgeographic/pathfinder_september_2018/wedge_it/189652/pencil.240_0_1.png)
Splitit,liftit,holditinplace.How?
ByGlenPhelan
SimpleMachines
Explorer magazine’ssix-partseries
Simple Machines
Explorer magazine’s six‑part series
This edition
HumanJourney
PhysicalScience
Beforeyoudothescienceactivityattheendofthisarticle,thinkabouthowyouwillrecordorgraphtheresults.