They [the students] also came upon new and unusual mathematical figures: the digon, a two-sided polygon on a spherical space, and the apeirogon, an open polygon with infinitely many sides […]. All these discoveries brought up even more questions. Is a circle a polygon? What makes an octagon an octagon – its eight vertices, its eight sides, or both? Can a polygon cross itself? Does a polygon need to be closed?

Finally she said, “Zach, i'm calling 911 and have them 5150 you.”

Large cranes were virtually non-existent in the areas I worked with this truck, so we jacked everything on and off[.]

In 1975 Clausen founded an association of amateur astronomers Volkssternwarte Laupheim e.V. and became its president. By organizing traveling astronomical exhibitions and numerous international astrofests, he expanded Laupheim's reputation far beyond Germany.