Research into circulation and respiration deals principally with the heart, blood vessels and lungs. It spans several important medical fields and diseases which impact significantly on both individuals and society.
Water is essential for life, but we don't need large quantities to keep us going – on the contrary, over-hydrating can be dangerous.
According to a large registry study of Swedish patients, broken-heart syndrome is linked to other diseases – but the risk factors for cardiovascular disease are normally lower in these patients.
Some people say that no one has ever died from a little dust. On the contrary, say others, dust is deadly. In reality, not all dust can be tarred with the same brush. Here is a guide to the dirt on earth – and on the moon.