1.   Even if tips were a purely economic message sent from diner to waiter, the widespread practice of pooling tips jams the signal.

2.   The Canadian government is considering changing its laws to allow restaurants, theaters, hospitals and other private companies to silence cell phones by jamming radio signals.

3.   The device, called a pulse generator, sends an electric current to his brain, jamming nerve signals from the globus pallidus.

4.   The drugs are designed to slow or jam growth signals in the cancerous cells.

5.   The pulse generator will send an electric current to his brain, jamming nerve signals from the globus pallidus.

6.   The Soviets once tried to stop Radio Liberty from broadcasting in Russia by banning the station and jamming its signal.

7.   He said these most likely would be aircraft that are specially equipped to detect and identify hostile air defense radars and either jam their signals or destroy them.

8.   It also has specialized airplanes that can jam the signals of hostile air defense radars or destroy them with missiles.

9.   Jamming GPS signals is relatively easy, according to a Transportation Department report last year on threats to the system.

10.   Radio Index had its signal jammed on Tuesday.