Two fierce predators, the oceanic white tip shark that inhabits deep offshore waters and the bull shark that patrols the murky shallows of rivers and estuaries, are examined. Underwater photographers search the depths off Hawaii for the dangerous and seldom seen oceanic white tip shark. Using their cameras for defense, they demonstrate how to survive an encounter with the predator responsible for the deaths of hundreds of shipwreck victims including those of the U.S.S. Indianapolis. In the shallow Bahaman waters, a scientist shows how to avoid being attacked by bull sharks using relaxation methods and body language technique.

With the mix of ever available food and labour saving technology, obesity is quickly spreading across the globe. Examine the science of fat with scientists whose experiments show that the body has a set weight that it strives to maintain. Listen to personal stories of people fighting obesity and the genetic breakthrough that could lead to the first anti-fat drug.

2003 marks the 50th anniversary of Francis Crick and James Watson groundbreaking discovery of DNA. In the half century that has followed, advances in the field of genetic science have come at a light speed. From genetically modified crops, or frankenfood, to Dolly th sheep, to recent rumours of the first cloned human baby, genetic research has and will continue to transform lives. Despite the huge coverage of genetic science, there is little sense that anyone is directing the debate.

Eighteen months into clinical trials for new cancer vaccine, world renowned Doctor, Steven Rosenberg from the National Cancer Institute, now has conclusive evidence that our bodies can be made to attack cancer. Working with patients that are terminally ill with the deadly skin cancer melanoma, Dr. Rosenberg has found that 42% of the patients are seeing their cancer disappear.These result more than double previously known response rate for melanoma and give real hope to patients suffering from this disease. Part medical detective story, part real-life drama. Two patients have been their cancer "melt-away", and one is nearly cancer free.

Viruses have been a powerful force throughout human history. Examine how man has struggled to identify, overcome and harness the power of viruses. View the battle against the poliovirus, how it was discovered, and how a vaccine was developed against it.