Period 6 element point of −38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal. Mercury occurs in deposits throughout the world mostly as cinnabar (mercuric sulfide). The red pigment vermilion is mostly obtained by reduction from cinnabar. Cinnabar is highly toxic by ingestion or inhalation of the dust. Mercury poisoning can also result from exposure to water-soluble forms of mercury (such as mercuric chloride or methylmercury), inhalation of mercury vapor, or eating seafood contaminated with mercury. Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, and other
Problem-posing education Problem-posing education Problem-posing education is a term coined by Brazilian educator Paulo Freire in his 1970 book "Pedagogy of the Oppressed". Problem-posing refers to a method of teaching that emphasizes critical thinking for the purpose of liberation. Freire used problem-posing as an alternative to the banking model of education. Freire's pedagogy emerged from his observations and experiences working as an instructor in literacy programs with peasant laborers in Brazil. During this work, Freire became aware of the economic, political, and social domination resulting from paternalism. Paternalism leads to a culture of silence, which keeps people from confronting their oppression. He