Thames & Kosmos Air-Walker Gravity-Defying Wall-Walking Robot Science Experiment Kit Kids ages 8 and up with learn about the physics of air pressure and suction and how it's used to help their Thames & Kosmos Air-Walker Gravity-Defying Wall-Walking Robot ($33) model walk vertically up perfectly smooth surfaces. Image Source: amazon.com Thames & Kosmos Air-Walker Gravity-Defying Wall-Walking Robot $33 from amazon.com Buy Now