He also spoke to a group of visiting schools (thanks for coming guys) and then again to all of our students and impressed us all with a performance that included a lot of science, many magnets, some attraction and repulsion (you can't go wrong with physics) and a resounding explosive conclusion to end it all.
My favourite message from Des (among so many, he is a wise man) - a book should be a pleasure to read. If it's hard work, it's the books fault, not the readers.