Broadcasting is the most popular source of entertainment in most nations. Newscasts have overwhelmed newspapers as a source of information about current affairs. The print media that flourish are those with a parasitical relationship with electronic information technologies. As radio broadcasting became a common activity, most state authorities concluded that state control was necessary. The broadcast media transcend space, but they have no temporal depth. The only tracings that broadcast sounds and sights leave are memories. Broadcast entertainment often transforms conceptions of the past and sometimes provides a foundation for the creation of new social enterprises. Several legislatures have enacted laws that restrict the use of the broadcast media by heads of state to lessen the likelihood of heads of state overpowering the legislature. Radio contributed to sports fandom, and also cultivated a star culture of popular musicians characterized by the rock and roll stars of the 1950s and 1960s.