Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread to other parts of the body. Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss and a change in bowel movements. While these symptoms may indicate cancer, they may have other causes. Over 100 types of cancers affect humans.
The fact that the general incidence of leukemia has doubled in the last two decades may be due, partly, to the increasing use of x-rays for numerous purposes. The incidence of leukemia in doctors, who are likely to be so exposed, is twice that of the general public. In radiologists … the incidence is ten times greater.
Isaac Asimov (1965) as quoted in Isaac Asimov’s Book of Science and Nature Quotations (1988), 233.
Small power stations are nothing new, but in the past they tended to use a lot of energy. An EU-funded project sought to build a more efficient and cheaper microgeneration system that should enable end users to substitute regular boilers once and for all.