4. A running joke among viewers of the medical drama House was that "it's never lupus," even though it frequently came up as a possible diagnosis to the patient-of-the-week's symptoms. Why is lupus
sometimes a difficult disease to diagnose but would often come up as doctors discuss a patient's
symptoms? What is the treatment regimen for Lupus?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.