For reasons that are not fully understood, mammalian cardiac muscle cells do not regenerate after suffering an injury. After a heart attack, for example, many of these cells, called cardiomyocytes, are lost and the body is unable to replace them. With fewer cardiomyocytes, the body cannot pump blood as efficiently, which leads to the increased 

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Nature does some pretty cool things and some very cruel things. Scientists have been fascinated by zombie ants for some time. These ants depart from their nest and normal duties to bite a piece of vegetation, after which they soon die. New research at the University of Central Florida sheds light on the mechanism by 

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