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DEFINITION: (noun) A group of cells that make up a section or unit of a prison. SYNONYMS: ward. USAGE: At the prison, one cellblock was reserved for particularly violent criminals, and it was monitored by twice the number of armed guards.

The contraceptive pill, or "the pill," which uses the hormones estrogen and progestin to prevent pregnancy, is currently used by about 100 million women worldwide. A number of studies have suggested possible links between contraceptive pill use and breast cancer, strokes, heart attacks, and blood clots, raising concerns about the medication's safety. Now, data from a 36 year study show that cancer risk was up to 12% lower in women who took the pill. However, those who used the medication for longer than 8 years were actually at increased risk of developing cancer.

Stem cells are unspecialized cells that can reproduce themselves for long periods of time using cell division, but are also capable of differentiating into almost any type of specialized cell. This unique ability makes them ideal for use in regenerative medicine. Adult stem cells are derived from umbilical cord blood and bone marrow. Embryonic stem cells are also used in medical research, but their use is more controversial. Why is there an ethical debate surrounding embryonic stem cell use?