grams of vouchers, school choice, charter schools, reduced class size, rapid routes to certification, and bilingual education are all topics to which research is relevant. Yet in decisions about these matters educational research has been relatively invisible, and the voices of educational researchers largely muted. The second clause of the theme, how we know it, alludes to the ambiguous episte...

number of icu beds is one in the important indexes of providing health care for the critically ill patients around the world. lack of icu beds may delay admission to icu and causes patients’ poorer prognosis [1]. there are 20 and 15 icu beds/100,000 inhabitants in the usa and canada respectively. in european countries including germany, france and uk the number of icu beds per 100,000 persons i...