Exercise invigorates the body and sharpens the mind. Author: Michael Crichton Copy Quote More from Michael Crichton “The fact that the biosphere responds unpredictably to our actions is not an arg…” “Cure the symptoms, cure the disease.” “The trouble with this country,” he said, “is that the women have no guts.They’d…” “The purpose of history is to explain the present - to say why the world around …”