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This came across my Facebook feed this morning regarding old books and X-rays. Apparently they found some nifty hidden writing by Galen.
The source is Smithsonian Magazine.
https://www.smithsonianmag.com/smart-news/researchers-use-high-powered-x-rays-reveal-scan-text-beneath-11th-century-religious-text-180968492/?utm_source=keywee-facebook.com&utm_medium=socialmedia&utm_campaign=keywee_mobile&kwp_0=727521&kwp_4=2566388&kwp_1=1088449