Finally, an unusual aircraft exhaust contrail photographed in
Ohio last month suggests that experimental research into "pulsed
detonation engines" or other forms of exotic propulsion
continues. The distinctive "donuts on a rope" contrail was
photographed east of Dayton, Ohio on November 10, 2006 by
William D. Telzerow. See:

http://www.fas.org/irp/mystery/donuts.html

_______________________________________________
Secrecy News is written by Steven Aftergood and published by the
Federation of American Scientists.

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_______________________
Steven Aftergood
Project on Government Secrecy
Federation of American Scientists

web: www.fas.org/sgp/index.html
email: saftergood@fas.org
voice: (202) 454-4691