Leonard McCoy payment for his appearance. In the "" episode "", McCoy mentions he has a daughter, Joanna. Although Chekov's friend Irina in the original series episode "The Way to Eden" was originally written as McCoy's daughter, it was changed before the episode was shot. In the 2009 "Star Trek" film, which takes place in an "alternate, parallel" reality, McCoy and Kirk become friends at Starfleet Academy, which McCoy joins after a divorce that he says "left [him] nothing but [his] bones." This line, improvised by Urban, explains how McCoy earned the nickname "Bones". McCoy later helps get Kirk posted aboard the
The Physics of Star Trek "Star Trek" universe. The book includes a foreword by astrophysicist Stephen Hawking. "The Physics of Star Trek" was met with generally positive reviews. It became a national bestseller and sold more than 200,000 copies in the United States. As of 1998, it was being translated into 13 different languages. It was also the basis of a BBC television production. Krauss got the idea for writing the book from his publisher, who initially suggested it as a joke. Krauss dismissed the idea but later thought that using "Star Trek" might get people interested in real physics. The hardcover edition was published