| http://www.w3.org/ns/prov#value | - The Pop Fly Challenge is a thing where you build a design to launch ping pong balls high enough to catch.We even caught the launched ping-pong ball in a cup.Our launcher was a paint stirrer on top of a paper cup.The paint stirrer had a ping-pong ball on one end and nothing on the other so it looked sort of like a see-saw.
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