You might have a friend who is “double-jointed" and can bend their fingers in freaky ways. Why are they are so flexible?

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Sources:
http://www.yalescientific.org/2010/05/why-are-some-people-double-jointed/
http://www.mayoclinic.org/diseases-conditions/dislocation/home/ovc-20234507
https://www.scientificamerican.com/article/people-who-are-double-jointed-are-more-likely-to-be-anxious/
https://ehlers-danlos.com/what-is-eds/

Image Source:
https://commons.wikimedia.org/wiki/File:Hypermobile_(double_jointed)_phalangeal_joints.JPG
https://upload.wikimedia.org/wikipedia/commons/8/8f/Doublejointedfinger.JPG
https://commons.wikimedia.org/wiki/Category:Elastic_cartilage#/media/File:Elastic_cart_100X.JPG