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This would be a super fun Christmas present for any little engineer / inventors you’ve got in your house. The Vibe 6-in-1 Solar-Powered Educational Robotic Kit is marked down to $4.99 for the next few hours ($9.98 with shipping). No batteries or tools required to put it together – and the kit can be made (and re-made again) into any of the 6 models shown above. Recommended for children 10+. Find it under the big orange “Family” tab.