Filter: News

• Cell phones betray pulse, respiration
  Friday 9 February 2001 – 06:24
  Even if a cell phone is not used for calls, routine signals reflected off the carrier's moving heart and lungs create a minute doppler shift which can be detected when the phone is stationary for only a few seconds.
• Printers betray document secrets
  Tuesday 19 October 2004 – 06:44
  US scientists have discovered that every desktop printer has a signature style that it invisibly leaves on all the documents it produces.