November 20, 2009
download KTEH activity book

 

Did you get a KTEH activity book and want to check your puzzle answers?

wordgirl

WordGirl Cryptogram Answer

WORDGIRL SOLVES ALL OF HER SLIPPERY PREDICAMENTS WITH HER DAZZLING VOCABULARY!



ruff ruffman

Ruff Ruffman Design Your Own Copter Challenge

When you drop your copter, its blades hit the air. The air pushes back on the blades, giving each one a little push forward. Notice how the blades are not exactly across from each other. This means that one blade is nudging one side of the copter round while the other blade is nudging the other side around. These two pushes work together to spin the copter around its center point. The spinning blades hit a lot of air on the way down, and all this air pushes back on the blades. The more air you can get to hit your blades (i.e., the more push-back you can create), the slower your copter will fall.
Download the full Copter Activity!

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