![](/nationalgeographic/adventurer_april_2019/simple_machines-pulley_power/245004/pulleys.800_0_1.png)
Don’tletaheavyloadmakeyoufrown.It’seasytoliftbypulling down.
ByGlen Phelan
Simple Machines
Explorer magazine’s six‑part series
SimpleMachines
Explorer magazine’s six‑part series
This edition
HumanJourney
PhysicalScience
Asyouread,thinkaboutallthepulleysyouseeanduseevery day.