A 13th century city restricted the movements of glassmakers to protect valuable production secrets. For much of history, reading aloud was more common than reading silently in the mind. An early music player without a volume control may have inspired a popular phrase. 

Alongside these histories, this episode traces the origins of words such as divulge, recite, endophasia, expose, radio silence and schtum. 

Transition sound by https://audionautix.com 

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https://www.prospectmagazine.co.uk/culture/47746/save-libraries-by-changing-them 

https://qz.com/quartzy/1118580/the-beginning-of-silent-reading-was-also-the-beginning-of-an-interior-life 

https://www.historyextra.com/period/medieval/why-do-we-say-mums-the-word/ 

https://uk.pcmag.com/operating-systems/135023/the-rise-of-dos-how-microsoft-got-the-ibm-pc-os-contract 

https://www.theguardian.com/media/2006/jul/07/marketingandpr.drink 

https://www.italymagazine.com/featured-story/brief-history-murano-glass-told-expert 

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