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Dr Helen Czerski examines the world of sound waves.
2015
0.0
2012
2004
6.0
2006
1974
6.8
1991
1.0
2007
2009
8.0
2005
2020
2018
7.0
1988
7.5
1964
7.4
2003
2.0
2013
7.1
5.4
2010
6.2
2014