From Igor Chudov’s newsletter.
Google has a “trends” page that allows anyone to see long-term trends for a particular search term.
Since timely statistics on recent births or pregnancies are not easily available in the USA, I decided to see the long-term five-year trend for the search term “maternity clothes” (archive link). As you would imagine, maternity clothes would be sought by a pregnant woman or by someone wanting to buy them for a pregnant woman in their life. So this search is associated with pregnancies.
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