Researchers are used to explaining scientific processes. Recently they have taken to explaining themselves. As we reported last week, on January 20th scientists who have created a new, more contagious form of bird flu explained in Science and Nature that they would take a 60-day hiatus from their research. The work of Ron Fouchier of the Erasmus Medical Centre, in Rotterdam, and Yoshihiro Kawaoka of the University of Wisconsin-Madison, had created such alarm that American officials had asked the two leading scientific journals to censor it.