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Gravity Bugs Free-Climbing MicroBot tgtg_ho20_5025 so just say whatever comesThe principles of air pressure and suction are fascinating, but not as awesome as a beetlebot you build that can scale walls! Includes a colorful 8 panel manual with step by step instructions for making a small but powerful robot. STEM skills abound. Requires 1 AAA battery (not included). From Thames & Kosmos, for ages 8 yrs teen. Watch the Video: