![](/nationalgeographic/adventurer_september_2018/wedge_it/188739/zipper.720_0_1.png)
![](/nationalgeographic/adventurer_september_2018/wedge_it/188749/chisel.400_0_1.png)
![](/nationalgeographic/adventurer_september_2018/wedge_it/188734/fork.128_0_1.png)
![](/nationalgeographic/adventurer_september_2018/wedge_it/188736/pin_yellow.128_0_1.png)
![](/nationalgeographic/adventurer_september_2018/wedge_it/188740/pin_blue.128_0_1.png)
![](/nationalgeographic/adventurer_september_2018/wedge_it/188737/shovel.640_0_1.png)
![](/nationalgeographic/adventurer_september_2018/wedge_it/188735/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
Human Journey
PhysicalScience
Beforeyoudothescienceactivityattheendofthisarticle,thinkabouthowyouwillrecordorgraphthe results.