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Controversial new research suggests that contrary to the history books, the "Black Death" that devastated medieval Europe was not the bubonic plague, but rather an Ebola-like virus. History books have long taught the Black Death, which wiped out a quarter of Europe's population in the Middle Ages, was caused by bubonic plague, spread by infected fleas that lived on black rats. But new research in England suggests the killer was actually an Ebola-like virus transmitted directly from person to person.

4 min video explaining the Lotus effect

This two-hour special, hosted by ABC "Nightline" correspondent Robert Krulwich, chronicles the fiercely competitive race to capture one of the biggest scientific prizes ever: the complete letter-by-letter sequence of genetic information that defines human life-the human genome. NOVA tells the story of the genome triumph and its profound implications for medicine and human health.

Researchers from the World Health Organization's International Agency for Research on Cancer (IARC) looked at more than 1,000 epidemiological studies and found that "excess body fatness" is also linked to the risk of developing gastric, liver, gallbladder, pancreatic, ovarian, thyroid, blood (multiple myeloma) and brain (meningioma) cancers.

A mother who didn't believe in vaccines for years is now writing about her experience after all seven of her children became sick with whooping cough and hopes to inspire other parents to reconsider vaccination.

Whether it's shunning all grains and dairy on a paleo diet, or bingeing on fruit juice to cure your cancer, "fad diets" push some misleading ideas about healthy eating. But knowing some red flags that are common signs of dodgy diets can help you avoid getting sucked in.