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Physics
NPL
The National Physical Laboratory is the UK's National Metrology Institute, developing and maintaining the national primary measurement standards.
https://www.npl.co.uk/
physics.org
physics.org is brought to you by the Physics in Society team at the Institute of Physics. Their aim is to inspire people of all ages about physics, and to highlight the best physics places on the web. Includes fun physics experiments that you can try at home, and information about careers.
http://www.physics.org/index.asp
Sixty Symbols
Curious and quirky videos describing the various symbols used in physics and astronomy, from the University of Nottingham.
http://www.sixtysymbols.com/index.html