In this video excerpt from NOVA scienceNOW, correspondent and New York Times technology columnist David Pogue learns how cutting an onion triggers chemical reactions that change the properties of the onion. Animations illustrate how enzymes are separated from other molecules inside the cells of an o
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Sulfur is the 16th element of the periodic table, and is a non-metal. In its elemental form it is a bright yellow crystalline solid at room temperature. In this video we are going to look at the basic physical and chemical properties of sulfur. We will also discover some real-life applications of s
