KU Leuven. "Surgeons Describe New Ligament in the Human Knee." ScienceDaily, 5 Nov. 2013, www.sciencedaily.com/releases/2013/11/131105081352.htm.
Langin, Katie. "Why Do Your Knuckles Crack? Engineers Say They Finally Figured It Out." Science, AAAS, 29 Mar. 2018, www.sciencemag.org/news/2018/03/why-do-your-knuckles-crack-engineers-say-they-finally-figured-it-out.
Rodriguez, Tori. "People Who Are Double-Jointed Are More Likely to Be Anxious." Scientific American, 1 July 2015, www.scientificamerican.com/article/people-who-are-double-jointed-are-more-likely-to-be-anxious.