Danny Johnson was on patrol outside Tampa, Florida, when a report came through of a possible shooting in a junkyard three blocks away. Arriving on the scene, he found an elderly man sitting on a tractor, with a large hole in his leg that was bleeding profusely.

First came word that a rare frog (Amolops tormotus) in China sings like a bird, then that the species produces very high-pitch ultrasonic sounds. Now scientists say that these concave-eared torrent frogs also hear and respond to the sounds.

Editor: Have a look at the videos: 1 & 2

Chemists at Harvard University have developed the first technique providing a real-time, molecule-by-molecule "movie" of protein production in live cells. Their direct observation of fluorescently tagged molecules in single cells -- providing striking real-time footage of the birth of individual new protein molecules inside -- greatly increases scientists' precision in probing genetic activity.

Neuroscientists at Case Western Reserve University School of Medicine have discovered a new cell type in the part of the brain that processes our sense of smell. This new cell type, the Blanes cell, is a member of a group of previously unstudied brain cells described by the Spanish neuroanatomist Blanes (pronounced blon – es) in the late 1800s. Blanes cells have unusual properties which may help the brain maintain memories of smells and also opens a new approach to understanding the basis of memory impairments in Alzheimer's disease. Their paper appears in the March 16 issue of the journal Neuron.

Scientists have identified a handful of microRNAs (miRNAs) that appear to play a significant role in the development of platelets – blood cells critical to the body's ability to form clots following an injury. They also say some of these same miRNAs, when acting abnormally, may contribute to certain forms of leukemia.

University of Michigan scientists have found a common genetic variation in an immune system gene that makes people much more likely to develop psoriasis – a disfiguring inflammatory skin disease.

Scientists have pinpointed exactly how botulinum neurotoxin A - a potential agent of biological warfare and one of the most lethal toxins known to man - is able to sneak into cells.

The National Human Genome Research Institute (NHGRI), one of the National Institutes of Health (NIH), today announced its latest round of sequencing targets, with an emphasis on enhancing the understanding of how human genes function and how genomic differences between individuals influence the risk of health and disease.

A diverse team of microbiologists, engineers and geochemists from the University of Southern California and Rice University are joining forces to create bacteria-powered fuel cells that could power spy drones that fit in the palm of a hand.

UK Biobank, a visionary medical project aimed at improving the prevention, diagnosis and treatment of cancer, heart disease, diabetes and many other serious conditions is launched this week after several years of meticulous planning.

Studying the gene-expression profiles of patients with colorectal cancer might help predict their response to chemotherapy. In a study published today in the open access journal Genome Biology, researchers identified in the tumours of colorectal cancer patients almost 700 genes whose expression was different between patients who subsequently responded well to combined chemotherapy and patients who were resistant to the therapy. These findings could be used in clinical practice to complement clinical, biochemical and genetic markers for better treatment of patients with colorectal cancer.