From the BBC:
The chance discovery of an antique notebook could have solved a 350-year-old scientific mystery.
Alexander Popham was born deaf in around 1650 but his mother, determined to communicate with her son, hired two eminent scientists, John Wallis and William Holder, to teach him to speak.
Both claimed success in what became a celebrated scientific controversy. Wallis’s notebook, found in the butler’s cupboard at Littlecote House, shows his methods and theories. Read the whole story here: Wallis Notebook.