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
What Kate Did 'Dad?' Hurley comments that he did not expect Rose's husband to be white, before Jack quickly changes the subject. The producers felt it was important to address that they are an interracial couple, and that Hurley was saying what the audience would be thinking. Caldwell agreed with them and thought it would be odd if the issue was not addressed. Anderson also was glad that Hurley brought up the issue, and liked that Jack did not pay any attention. The episode gained 21.54 million American viewers in its first airing. What Kate Did "What Kate Did" is the 34th episode