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Walmart has the Fischertechnik Advanced Solar Construction Set on sale for $9.75 (was $29.99).
With this construction set, children can receive their first experiences
with renewable energy in a fun way. The solar rotor, a combination of
solar panels and a motor, is the key component of the three models and
uses the power of the sun to rotate the propeller. The helicopter, air
boat and fan use solar energy to move.