What is the difference between geochemistry and geophysics?
R.W. A geophysicist typically deals with seismology and stuff like that. Geochemistry is more what I do, study the chemistry of rocks and materials. Although I have a degree in physics, geochemistry is more fitting for what I do. I got my Ph.D. from a physics department doing geochemistry. I also studied (have a minor in) geology. I was using mass spectrometers that were developed for meteorites and moon rocks that were developed by physicists in that department. A.K. You have been a visiting scientist at two US institutions and at a University in Switzerland. What is a visiting scientist? How did you become one? R.W. While I was on staff at Caltech, I was interested in using techniques that were available elsewhere. I took samples to Argonne National Laboratory and worked there for a number of two to three week periods. They had the facilities and equipment. It was a similar thing with Switzerland. They had the facilities to test a prototype solar wind concentrator. We built it at Cal