The oldest theropod known (in fact, currently the oldest known North American dinosaur) is Camposaurus of the middle Late Triassic. Much better known, however, is Coelophysis of the late Late Triassic.
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A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axesâlike an upside-down mouse with an exposed protruding ball.The user rolls the ball with the thumb, fingers, or the palm of the hand to move a pointer.Compared with a mouse, a trackball has no limits on effective travel; at times, a mouse can reach an edge of its working area while the operator still wishes to move the screen pointer farther.he user rolls the ball with the thumb, fingers, or the palm of the hand to move a pointer. Compared with a mouse, a trackball has no limits on effective travel; at times, a mouse can reach an edge of its working area while the operator still wishes to move the screen pointer farther.