(Redstone Noob) How does this work? Why is the bottom piston activated? via /r/Minecraft

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(Redstone Noob) How does this work? Why is the bottom piston activated?
http://ift.tt/2oNT9yZ

Submitted April 30, 2017 at 10:30PM by bt92130
via reddit http://ift.tt/2qu3axL