Two drugs commonly prescribed to treat diabetes double the risk of heart failure, according to new research by the University of East Anglia (UEA).

Rosiglitazone (Avandia) and Pioglitazone (Actos) are recommended by the National Institute of Clinical Excellence (NICE) for the treatment of Type II Diabetes. Prescriptions for the drugs, known as thiazolidinediones, have doubled over the last three years and they were taken by more than 1.5 million people in England last year.

The new research was undertaken by Dr Yoon Loke, a clinical pharmacologist at UEA’s School of Medicine, Health Policy and Practice, working with colleagues at Wake Forest University in the US. The results are published in the August edition of the journal Diabetes Care.

In the hot springs of Yellowstone National Park, a team of researchers have discovered a new genus and species of chlorophyll-producing bacterium that transforms light into chemical energy. The discovery is described in a paper written by Don Bryant of Penn State University and David M. Ward of Montana State University.

Yellowstone National Park is a tourist's wonderland because of its wildlife, mountains, geysers and hot springs. But the park is also a scientific reservoir that harbors what may be the world's largest diversity of thermophilic (heat-loving) microorganisms.

There is now enough evidence to warn young people that using cannabis could increase their risk of developing a psychotic illness later in life by more than 40%, conclude authors of an Article published in this week’s edition of The Lancet. “Governments would do well to invest in sustained and effective education campaigns on the risks to health of taking cannabis.”

Cannabis, or marijuana, is the most commonly used illegal substance in most countries, including the UK and USA.

Only a quarter of the $1.5 billion donated by G8 leaders to eradicate disease among poor children will be spent on the costs of vaccines, while three-quarters will go to profits. G8 should instead negotiate the lowest, sustainable, non-profit price in order to maximize the number of lives saved and children who can benefit.

The blue coloring in tortillas is more than just appearance. The color is due to the presence of anthocyanins in the corn and these are the same health promoting compounds found in purple berries and red wine.

Scientists in Mexico, home of the taco, found that tortillas made from blue corn had less starch and a lower glycæmic index than their white counter parts. They also found that the blue tortillas had 20% more protein than white.

The glycæmic index (GI) ranks carbohydrates according to their effects on blood glucose levels. Foods with a lower GI are considered healthier as they slowly release sugar into the bloodstream. This reduces fluctuations in our blood glucose and insulin levels, helping to maintain a steady supply of energy.

The abundant diversity of characteristics within species likely helped fuel the proliferation and evolution of an odd-looking creature that emerged from an unprecedented explosion of life on Earth more than 500 million years ago.

“From an evolutionary perspective, the more variable a species is, the more raw material natural selection has to operate on,” said paleontologist Mark Webster, an Assistant Professor in Geophysical Sciences at Chicago.

Paleontologists for decades have suspected that highly variable species evolved more rapidly than others, said Nigel Hughes, Professor of Earth Sciences at the University of California, Riverside.