The Great Circle Challenge - 60 piece 3D puzzle Closeout Sale The globe rotates when the

The globe rotates when the turning gear is rotated using all wood gears and drive shafts - ingenious engineering

Dust evidence for prints to match against suspect prints

2 ABFO-type Photomacrographic Scale – Metric

Public domain art by Jenny Nyström

The Great Circle Challenge - 60 piece 3D puzzle Closeout Sale The globe rotates when theCan you assemble this 3 D puzzle into a 9 1 2" sphere? There are 60 almost identical pieces that need to be assembled in a specific sequence are you up or the challenge? Multitudes of possibilities can easily lead you astray.. can you stay on the right path? The Great Circle Challenge is made of 15 intersecting Great Circles. A great circle is like the equator it separates a sphere into two equal spaces.