Have you experienced embarrassing voice cracking? Most people have, and there’s a lot of reasons why you might be affected. From illness, stress, and good old puberty.

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Sources:
http://kidshealth.org/en/teens/voice-changing.html#
http://medicalterms.info/anatomy/Larynx/
https://en.wikipedia.org/wiki/Larynx#/media/File:Illu_larynx.jpg
http://www.askdoctork.com/why-does-a-boys-voice-change-during-puberty-201511248584
http://www.todayifoundout.com/index.php/2011/10/why-voices-squeak-during-puberty/
https://www.reddit.com/r/askscience/comments/31p5sh/what_makes_our_voice_crack/
http://ncvs.org/e-learning/faqs.html
http://takelessons.com/blog/voice-cracks-when-singing-z02
http://www.pitara.com/science-for-kids/5ws-and-h/why-are-human-voices-different/
http://www.thedoctorstv.com/videos/why-does-your-voice-shake-when-you-re-nervous
http://www.asha.org/public/speech/disorders/NodulesPolyps/
Images:
https://commons.wikimedia.org/wiki/File:Illu_larynx.jpg