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Magical Floating Planter Box
Create a Storm Glass (Instrument For Weather Prediction)
Open Pad Locks and Combination Locks With A Soda Can
Super Simple Light Tent
Portal Companion Cube
Easy Candy Floss (Cotton Candy) Machine from Junk
Make a Photon Flower That Lights Up When You Water It with Lemon Juice
How to X-Ray
Easiest raft ever, it seems.
How to build an LED Planetarium
Make a Cardboard Boat