The host response is the defense mechanism of the host against exogenous microorganisms.

Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame.

In Dallas and Houston, the dominant architectural forms are glass office towers and air-conditioned shopping malls that owe more to the Bauhaus than to the North Forty.

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