A biosafety level is the level of the biocontainment precautions required to isolate dangerous biological agents in an enclosed facility. The levels of containment range from the lowest biosafety level 1 (BSL-1) to the highest at level 4 (BSL-4). In the United States, the Centers for Disease Control and Prevention (CDC) have specified these levels. In the European Union, the same biosafety levels are defined in a directive.
Read more about Biosafety Level: History, Rationale, List of BSL-4 Facilities
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“So long as State constitutions say that all may vote when twenty-one, save idiots, lunatics, convicts and women, you are brought down politically to the level of those others disfranchised.”
—Susan B. Anthony (1820–1906)