Above: Hidden Observer by my colleague David Lidzey, by kind permission.

Professor Mark Geoghegan
Department of Physics and Astronomy
University of Sheffield
Hicks Building
Hounsfield Road
Sheffield
United Kingdom
S3 7RH

Telephone: +44 (0)114 222 3544
Fax: +44 (0)114 222 3555

E-mail: mark.geoghegan_AT_sheffield.ac.uk

 

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