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This article considers how we classify these sibships, given the important implications for the pair members, their families, their friends and the professionals who care for them. Next, reviews of research on twins\u2019 birth weight and brain development, twinning and vocabulary knowledge, fetal loss in twin pregnancy and twin-family Olympic medal winners are presented. The final topic covers recent media attention to young twin soldiers, a twin-run laundry, a male-female pair\u2019s political differences, a twin-based graphic novel and twin sisters\u2019 deliveries.<\/jats:p>","DOI":"10.1017\/thg.2020.93","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T13:39:09Z","timestamp":1619444349000},"page":"89-94","source":"Crossref","is-referenced-by-count":3,"title":["Twin Types: Variations and Common Themes\/Twin Research Reviews: Birth Weight and Brain Development; Twinning and Vocabulary Knowledge; Fetal Loss in Twin Pregnancy; Twin-Family Olympic Medal Winners\/Human Interest: Young Twin Soldiers; Twin-Run Laundry; Male-Female Pair and Politics; Twin-Based Graphic Novel; Twin Sisters\u2019 Deliveries"],"prefix":"10.1017","volume":"24","author":[{"given":"Nancy L.","family":"Segal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2021,4,26]]},"reference":[{"key":"S1832427420000936_ref15","doi-asserted-by":"publisher","DOI":"10.1002\/hbm.25188"},{"key":"S1832427420000936_ref24","article-title":"Psychological features of human reproductive cloning: A twin-based perspective","volume":"23","author":"Segal","year":"2006","journal-title":"Psychiatric Times"},{"key":"S1832427420000936_ref6","unstructured":"Bennet, J. , Kinsbury, K. , Dao, J. , & Silverstein, J. 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