Klein Bottle NecklaceThe Klein bottle is a fascinating topological shape first described in 1882 by German mathematician Felix Klein. It's what's called in mathematics a non orientable, one sided surface with no boundary. An orientable surface is one that can't be transformed into its mirror image by moving a shape along the surface. This means that both the Mbius strip and the Klein bottle are non orientable. To determine if something is one sided, imagine walking across

This pendant is small-batch cast from pewter and has been hand hammered and weathered for an antique look

It is still used today as a teaching aid in many preschools and elementary schools

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000 mi) beyond Earth's orbit around the Sun

Recently a historic and mind-blowing astronomical image swept across the planet

Made of plasma

The little circle on the right side of the pendant shows where humans reside in the diagram

The stars in the Big Dipper are also handy in finding Polaris

Each earring is two-sided

dates back to 2000 B

and are among the first things to grow on freshly-exposed rock after a rock slide

it was also originally meant as a warning to take care of oneself first