How much oxygen do you consume in a day? If you do the arithmetic (proportion of air extracted as oxygen, times tidal volume, times respiratory rate, times minutes per day) it comes to around 500 litres per day. We are largely unaware that we consume so much gas, probably because we cannot see or feel it, just as fish presumably cannot see or feel water. We are of course far more aware of how m...

Asymmetric cell division plays a major role in the generation of cell diversity during development. In this issue of Neuron, Sun and colleagues present evidence that the epidermal growth factor receptor is asymmetrically distributed in mitotic cerebral cortical precursors, and the resulting unequal inheritance generates offspring with different responsiveness to growth factor and unique cell fa...

objectives: some studies show that quality of life in elderly can change due to aging process and its natural limitations. there are many methods to improve quality of life in old age, and doing simple physical exercises are among the easiest and the most cost effective methods that can improve quality of life in old persons. this study investigates the effect of aerobic exercise on quality of ...