The results show that 56 (80 per cent) of the 70 teaspoons disappeared during the study, and that the half life of the teaspoons was 81 days (that is, half had disappeared permanently after that time).
https://www.abc.net.au/news/2018-11-07/spoons-disappearing-from-the-office-kitchen/10469728?smid=Page:+ABC+Science-Facebook_Organic&WT.tsrc=Facebook_Organic&sf201723336=1
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