Superconductivity and carbon nanotubes, are Type I, while almost all impure and compound superconductors are Type II. Conversely, a spinning superconductor generates a magnetic field, precisely aligned with the spin axis. The effect, the London moment, was put to good use in Gravity Probe B. This experiment measured the magnetic fields of four superconducting gyroscopes to determine their spin axes. This was critical to the experiment since it is one of the few ways to accurately determine the spin axis of an otherwise featureless sphere. Superconductivity was discovered on April 8, 1911 by Heike Kamerlingh Onnes, who was studying the resistance
Heike Hennig 1995, Heike Hennig came back to Germany. From 1998 onwards, she worked as a freelance choreographer and teacher. She instructed body- and moving-oriented teaching-methods at the "Palucca School of Dance", the "University of Leipzig" and the "Academy of Visual Arts in Leipzig" as well as in interdisciplinary workshops including anatomy, painting and choreography. In 2000, Heike Hennig founded the FZTM (Forum of Contemporary Dance and Music) in Leipzig, together with Friedrich U. Minkus, and her ensemble Heike Hennig & Co. As director she developed numerous stage pieces and interdisciplinary art projects at many different stages and art institutions in Leipzig,