(Program not available for streaming.) Fifty years later, what can science tell us about the Kennedy assassination—and the investigations that followed? The 1963 murder, in broad daylight in front of hundreds of witnesses, might seem to be a homicide investigator's best-case scenario. Yet somehow the JFK assassination became a forensic nightmare, plagued by a controversial autopsy and, incredibly, a prime suspect murdered on live television while in police custody, before he could be tried.

Getty ImagesWhat do a "ginnel" and a "twitten" have in common? They are both local words meaning an alleyway - but are popularly used at opposite ends of England. They are among a dozen regional words chosen for inclusion in 12 new poems on National Poetry Day on 28 September. One of the poems uses all 12 words, including "dimpsy" and "mardy", and will be read out on BBC radio.

Running for almost 450km and to a depth of 1,800m, it is simply too vast for the five million tourists who visit the National Park each year to take it in. Many try their best by taking a plane or helicopter ride through the deep incision, which records nearly two billion years of Earth history. ncG1vNJzZmivp6x7o67CZ5qopV%2Bjsri%2Fjqyaop2emLJusc2voKunnqKyr8CMa2xxcGFugnQ%3D

Explore More Bob Junior, a beloved lion dubbed “king of the Serengeti” for his majestic appearance, has been killed by a trio of younger rivals in a battle for dominance. Bob Junior, named so because he was the son of a lion called Bob Marley, was mauled to death Saturday. He was said to have been about 10 years old. The celebrated predator reportedly did not put up a fight and was worn down by his assailants.

Like many of President Trump’s tweets, the one lashing out at filmmaker Michael Moore seemed to come out of nowhere. “While not at all presidential ... ” it began, before taking aim at Moore’s Broadway play, “The Terms of My Surrender,” which had ended its run the weekend before. “I must point out that the Sloppy Michael Moore Show on Broadway was a TOTAL BOMB and was forced to close. Sad!” Trump tweeted.