ECONOMISTS have long been obsessed with signals.
This signal is transmitted to a computer, where it merges with signals streaming from other CosTunes.
"The Earth has been smoked, with signals very clearly around the world in the mid-20th century," said Zalasiewicz.
In future, they say, all cars should go on rails, with signals and points dictating every turn.
The city's subway tracks are equipped with signals that follow trains through the system.
Michael Primeggia, deputy commissioner for traffic operations for the Department of Transportation, which oversees the city's 11,200 intersections with signals, understands it.
In Russia, the will of the state is expressed with signals of varying subtlety; the invocation of "national traitors" is among the less oblique examples of the genre.
Audiovox and Kenwood sell similar systems -- at similar prices -- that are compatible with signals from Sirius Satellite Radio of New York, XM's rival.
Huge progress has been made in getting cellphones to developing countries, with signals now available in more than three-quarters of the developing world.
Large broadcasters say the low-power stations would interfere with signals of existing stations, while the F.C.C. says broadcasters are really just concerned about competition for listeners.
