Thames & Kosmos Hydraulic Boxing Bots STEM Experiment Kit

• Amazon now offers the Thames & Kosmos Hydraulic Boxing Bot Experiment Kit, now $29.99 (was $49.95).
• Prime members get free two-day shipping, and regular members get free shipping on orders over $35 within the contiguous U.S.
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Editor's Pick: If you have kids who enjoy hands-on building, this kit lets them assemble two boxing robots. By injecting water into the pistons, they control the punch extension—landing a hit even registers points on the scoreboard. The upper and lower body move independently, making dodges and punches look realistic. Two players each control one robot for head-to-head battles, which is much more fun than playing solo with separate devices.