If you thought T-Rex was the scariest dinosaur - think again. Paleontologist Dr. Phillip Currie believes he has found a six-ton flesh-eating dinosaur that hunted its prey in packs. Recently there was little evidence to support Currie's ideas. But that's all changed now he has twomass dinosaur graves on his hands. The site in Canada was originally found by one of the best known characters of the golden age of dinosaur discovery.

For many years the umbilical cord and placenta were seen as medical waste. But now their life-saving potential has caused a sensation throught the medical community. Cord blood is rich in stem cells, which can replace defective blood. Thid film follows the patients whose lives have been saved by the cord blood of donor babies.

Ocean in every 100,000 births, parents and doctors are presented with one of natures greatest challenges. Twins are born, to joined together. What causes twins to be born this way? What can Doctors do to help them? And what are the prospects for spend their lives joined together? This documentary, filmed in the USA, South Africa, Russia and Poland, tells the story of some of the most dramatic recent separations of conjoined twin babies - and interviews adult twins who remained conjoined.

The mosquito used to be thought of as a mere nuisance until, in Victorian times, it was revealed that they were the ultimate killing machine, spreading the sometimes fatal disease of malaria. A century on, Horizon traces the astonishing war on the insect that this discovery unleashed, and how the mosquito and malaria have returned, increasingly immune to man's chemical weapons and spreading once more. Determined and seemingly unstoppable, together mosquitos and malaria are nature's deadliest partnership.

Because of Economy class syndrome, a bride-to-be from Newport in South Wales collapsed and died from a blood clot moments after walking off a long haul flight from Melbourne, Australia. Emma Christoffersen was diagnosed as having suffered a pulmonary embolus brought on by the immobility associated with long hyaul travel or flight-related Deep Vein Thrombosis. The airlines argue that this condition is rare and certainly not exclusive to air travel. But leading vascular surgeon, John Scurr, announced to the medical world that roughly one in 100 air passengers probably develop blood clots while flying long haul. Reporter Andy Davies investiges how the issue of DVT has been handled by the aviation industry.