Laboratory, solar system, and astrophysical experiments for the "speed of g
ravity" yield a lower limit of 2 x 10(10)c. The link between relativity and
the causality principle involves issues of the meaning of gravitational wa
ves and curved spacetime analogies. Apparently, Lorentzian relativity bette
r describes nature than special relativity. (C) 1998 Elsevier Science B.V.