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chomp on them and let them soothe sore gums
4M - Salt-Powered Robot Eye-Brown chomp on them and letPut this mini robot by 4M together, then add salty water to the specially designed battery cartridges to make it move! This is a fun, simple way to learn about alternative energy while encouraging children to get hands on with science. The assembled robot is 10cm tall, and its head and arms do not move. This set includes a chassis, a pivot, bent arms, a battery holder, a battery base, a battery lid, a motor with wires and contacts, a plain axle and
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