and try to route out the corruption in the wildlife authority. he trained hundreds of kenyan scientists, wardens people in the wildlife sector and created a culture of conservation in kenya. doctor paula, unfortunately we are short of time. but really good to have your thoughts and memories on richard leakey. thank you so much forjoining us. a teenage boy has been charged with the murder of 15 year old zaian aimable lina in croydon, south london, on thursday, police said. the teenager who is also 15, was arrested on suspicion of murder late on new year s day. he will appear in court on tuesday. queen elizabeth will celebrate her platinum jubilee this year, when she becomes the first british monarch to reign for 70 years. the queen is set to pass the milestone on sixth february , the anniversary of the death of her father, king george vi, in 1952. 0ur royal correspondent, daniela relph, looks at the significance ofjubilees.