Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month Pros:She works. It took about a minute to assemble and start testing the laws of physics. Fun little thing (emphasis on little, see below) and good looking. Cons:Outside of the metal on the balls, everything is made of plastic... including the base and arches that... Read more

Involvement:General (knows how to use it) - Ownership:1 day to 1 week Pros:It is small, quite light but well built. Size very conveniable for having on a small working table (as long as it does not annoy office colleages). Spanish: Pequeño, ligero pero bien construido. Muy aconsejable para tener en una mesa de trabajo pequeña (siempre... Read more