Cancer

Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these cells to invade other tissues, either by direct growth into adjacent tissue through invasion or by implantation into distant sites by metastasis. Metastasis is defined as the stage in which cancer cells are transported through the bloodstream or lymphatic system. Cancer may affect people at all ages, but risk tends to increase with age, due to the fact that DNA damage becomes more apparent in aging DNA. It is one of the leading causes of death in developed countries.

There are many types of cancer. Severity of symptoms depends on the site and character of the malignancy and whether there is metastasis. A definitive diagnosis usually requires the histologic examination of tissue by a pathologist. This tissue is obtained by biopsy or surgery. Most cancers can be treated and some cured, depending on the specific type, location, and stage. Once diagnosed, cancer is usually treated with a combination of surgery, chemotherapy and radiotherapy. As research develops, treatments are becoming more specific for the type of cancer pathology. Drugs that target specific cancers already exist for several cancers. If untreated, cancers may eventually cause illness and death, though this is not always the case.

MP3 – a worldwide mania

Who is the one who had never downloaded a song from the Internet? Although companies try to prohibit or simply prevent people from downloading, MP3 download is a reality: MP3 is there, at anyone’s disposal. All that people need is a computer and a connection.

All this concern about this type of download has to do – of course – of how much money the music industries are not earning. Besides, there is risk of piracy. Studies suggest that piracy – the practice of building CDs or DVDs with no permission of the owner’s – has increased a lot in the past few years. Music companies and artists blame the possibility to download their songs or videos from Internet.