European exploration of Africa 1840s, so that around the midpoint of the 19th century and the beginning of the colonial Scramble for Africa, the unexplored parts were now limited to what would turn out to be the Congo Basin and the African Great Lakes. This "Heart of Africa" remained one of the last remaining "blank spots" on world maps of the later 19th century (alongside the Arctic, Antarctic and the interior of the Amazon basin). It was left for 19th-century European explorers, including those searching for the famed sources of the Nile, notably John Hanning Speke, Sir Richard Burton, David Livingstone and Henry Morton
Dennis the Menace and Gnasher from the early 1970s and has been replaced, although the character was absent for most of the intervening period, in the 2009 TV Series by another Teacher named Mrs Creecher. Nasty Norman was a bully often seen as Dennis's rival. Stanley Livingstone an explorer with a pet crocodile, who lived next door to Dennis. Seemingly replaced by the Colonel, though the character had disappeared a while before the Colonel first appeared. His name alludes to the explorers David Livingstone and H.M. Stanley. BBC News once called Dennis the 'definitive naughty boy'. Matthew Jarron of Dundee University, curator of a Beano