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...r designed by a commission assembled by Pope Gregory XIII in the sixteenth century."}}{{efn|Many countries that use other calendars for religious purposes use ...ays; when Russia and Greece did so (for their civil calendars) in the 20th century, the jump was 13 days. For other countries and territories, see [[List of a ...

...s Report, 25 February 1993</ref><ref name="RebeccaLeung"/> and a twentieth-century trend toward smaller families in developed countries continued.<ref>{{cite ...adults and children was much smaller than it is in the early twenty-first century. Between 1953 and 2006, adult gains on the vocabulary subtest of the [[Wech ...