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Despite a 30-year lifespan that gives ample time for cells to grow cancerous, a small rodent species called a naked mole rat has never been found with tumors of any kind—and now biologists at the University of Rochester think they know why.

The "trojan horse" therapy has the potential to directly target cancer cells with chemotherapy, rather than the current treatment that sees chemotherapy drugs injected into a cancer patient and attacking both cancer and healthy cells.

Sydney scientists Dr Jennifer MacDiarmid and Dr Himanshu Brahmbhatt, who formed EnGenelC Pty Ltd in 2001, said they had achieved 100 percent survival in mice with human cancer cells by using the "trojan horse" therapy in the past two years.

Members of the genus Arenavirus, comprising currently 22 recognized species (http://www.ictvonline.org/virusTaxonomy.​asp?version=2008 ), are divided into two complexes based on serologic, genetic, and geographic relationships [1],[2]: the New World (NW) or Tacaribe complex, and the Old World (OW) or Lassa-Lymphocytic choriomeningitis complex that includes the ubiquitous arenavirus type-species Lymphocytic choriomeningitis virus (LCMV; [3]).

Many people may suppose that the question of the title is a stupid one, given that the answer is so obvious: women have breasts for feeding babies. In fact, the question is a good one, because it is a mystery why the vast majority of women have breasts. Most women are, at this moment, not lactating, and yet they have breasts. If breasts were merely for feeding babies, then most women would not have them. They would develop them only during pregnancy, and would lose them again when they stopped breast-feeding.