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Our world is a planet where human beings have formed many societies.
Nobody knows whether there are intelligent beings on other worlds.
There are about one septillion (1024) worlds in the universe.[1][2][3]
References[edit]
- ^ Burci, Gian Luca; Vignes, Claude-Henri (2004). World Health Organization. Kluwer Law International. ISBN 9789041122735. Pages 15–20.
- ^ Walker, Elizabeth Reisinger; McGee, Robin E.; Druss, Benjamin G. (2015-04-01). "Mortality in mental disorders and global disease burden implications: a systematic review and meta-analysis". JAMA psychiatry. 72 (4): 334–341. doi:10.1001/jamapsychiatry.2014.2502. ISSN 2168-6238. PMC 4461039. PMID 25671328.
- ^ Mock, Charles N.; Donkor, Peter; Gawande, Atul; Jamison, Dean T.; Kruk, Margaret E.; Debas, Haile T. (2015-05-30). "Essential surgery: key messages from Disease Control Priorities, 3rd edition". Lancet. 385 (9983): 2209–2219. doi:10.1016/S0140-6736(15)60091-5. ISSN 1474-547X. PMID 25662414.
