Guests: Joseph Kirschvink/ Professor of Geobiology California Institute of Technology Pasadena, California David Evans/ Graduate Student, Division of Geological and Planetary Sciences California Institute of Technology Pasadena California Richard Bottomley/ Professor of Physics Canadian University College College Heights Alberta, Canada Larry Magid/ Syndicated Columnist Los Angeles Times; Contributing Editor Home PC Magazine Palo Alto, California More than 500 million years ago, the Earth's poles migrated, rearranging the continents. At about the same time life on Earth diversified at a rate twenty times faster than normal. Now researchers think they know the connection between the two. In this hour of Science Friday, we'll hear how geologic evidence is providing new information about past biologic events. Plus get your computer questions ready because it's time for our computer update show.