No one even vaguely interested in either history or science could fail to be heartbroken by this news that Charles Darwin’s notebooks have been missing, presumed stolen, for twenty years. ‘One of them contains the 19th Century scientist’s famous Tree of Life sketch, exploring the evolutionary relationship between species. Following an “extensive search”, curators have now concluded they have probably been stolen. They are launching a public appeal for help in trying to find them.’ The theory of evolution is one of the most important scientific ideas ever. That the notebooks containing it’s very beginnings could have disappeared is surely tragic.