Ig Nobel Peace Prize goes to inventor of electromechaical teenager repellant.

PEACE: Howard Stapleton of Merthyr Tydfil, Wales, for inventing an electromechanical teenager repellant -- a device that makes annoying noise designed to be audible to teenagers but not to adults; and for later using that same technology to make telephone ringtones that are audible to teenagers but not to their teachers.

Mathmatics prize goes to Australian scientists for calculating the number of pictures necessary (almost) to ensure no members of a group will have their eyes closed; award in chemistry given to Spanish researchers for their study, "Ultrasonic Velocity in Cheddar Cheese as Affected by Temperature." And more.

Winners were announced Thursday, Oct. 5, at Sanders Theatre, Harvard. A webcast of the award ceremony - and a full list of winners - is available at the Improbable Research web site.