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I have a single waving hand ...

I have a single waving hand I'm present in places across the land On fairer days, I depart I shorten with a broken heart. What am I?

Correct answers: 38

The first user who solved this task is Djordje Timotijevic.

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Teacher and student

Teacher: "What is the chemical formula for water?"
Student: "HIJKLMNO."
Teacher: "What are you talking about?"
Student: "Yesterday you said it's H to O!"

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Jakob Steiner

Died 1 Apr 1863 at age 67 (born 18 Mar 1796).Swiss mathematician who was one of the greatest, contributors to projective geometry. He discovered the Steiner surface which has a double infinity of conic sections on it. The Steiner theorem states that the two pencils by which a conic is projected from two of its points are projectively related. He is also known for the Poncelet-Steiner theorem which shows that only one given circle and a straight edge are required for Euclidean constructions. His work included conic sections and surfaces, the theory of second-degree surfaces and centre-of-gravity problems. He developed the principle of symmetrization (1840-41). In 1848 he ws the first to define various polar curves with respect to a given curve, and introduced the “Steiner Curves.”«

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