A diary written 140 years ago by Scots explorer David Livingstone can now be read for the first time after experts shed new light on the badly-faded text. Scientists used spectral imaging to recover the account of the massacre of 400 slaves, which had been written on old newspaper with makeshift ink. The manuscript, written in central Africa, deteriorated rapidly and is now virtually invisible to the naked eye. It has gone on show at the National Library of Scotland in Edinburgh. An international team of experts took part in the 18-month project to uncover Livingstone's personal account of the...