41.   For years, boaters relied on a system called long-range navigation, or Loran, which uses on-shore beacons transmitting radio signals.

42.   Future controls will be by radio signals.

43.   Harvey Butcher, director of the Netherlands Foundation for Research in Astronomy, said it was vital to restrict radio signals in these areas.

44.   Hackers find it easy to infiltrate wireless networks because they use radio signals that are transmitted at the same frequency as most cordless telephones.

45.   He is collaborating with biomedical engineers at Duke to build brain implants that would communicate with a computer through radio signals, eliminating the need for a tether.

46.   Heiser and his colleagues have patented a bracelet embedded with a computer chip that receives and transmits radio signals.

47.   High-temperature superconductors have found use in cellular telephone towers as electronic filters to separate radio signals of individual phone calls.

48.   His own everyday wristwatch reset itself by radio signals from the atomic clock in Denver.

49.   If the wearer is panicked, it sends a radio signal to the police that identifies its location.

50.   If there is a sudden change in pulse indicative of a panic response, the bra transmits a radio signal that summons the local police and indicates its location.