— The film of a soap bubble 4 is the 2,500,000 th part of an inch in thickness:-
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https://paperspast.natlib.govt.nz/newspapers/OW19270621.2.109
Bibliographic details
Otago Witness, Issue 3823, 21 June 1927, Page 28
Word Count
17Untitled Otago Witness, Issue 3823, 21 June 1927, Page 28
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