Science and Medicine
The COVID-19 pandemic that started in 2020 and ended in May 2023 significantly impacted liturgical celebrations of the Catholic Church worldwide. The Pontifical Foundation Aid to the Church in Need (ACN) stated that the pandemic was not "just a medical, social and economic problem, but also a pastoral problem", which led ACN to start encouraging a special program for the actions of priests and religious against the virus spread.
2017–2018 United States flu season.
Canadian genocide of Indigenous peoples.
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