Phase Change Materials

Famous quotes containing the words phase, change and/or materials:

    “The problem of the twentieth century is the problem of the color-line—the relation of the darker to the lighter races of men in Asia and Africa, in America and the islands of the sea. It was a phase of this problem that caused the Civil War.”
    —W.E.B. (William Edward Burghardt)

    “... often in the heat of noonday, leaning on a hoe, looking across valleys at the mountains, so blue, so close, my only conscious thought was, “How can I ever get away from here? How can I get to where they have books, where I can be educated?” I worked hard, always waiting for something to happen to change things. There came a time when I knew I must make them happen; that no one would do anything about it for me. And I did.”
    —Belinda Jelliffe (1892–1979)

    “Though the hen should sit all day, she could lay only one egg, and, besides, would not have picked up materials for another.”
    —Henry David Thoreau (1817–1862)