The discipline of radiation hydrodynamics is the branch of hydrodynamics in which the moving fluid absorbs and emits electromagnetic radiation, and in so doing modifies its dynamical behavior. That is, the net gain or loss of energy by parcels of the fluid material through absorption or emission of radiation are sufficient to change the pressure of the material, and therefore change its motion; alternatively, the net momentum exchange between radiation and matter may alter the motion of the matter directly. Ignoring the radiation contributions to energy and momentum will give a wrong prediction of the hydrodynamic motion when the correct description is radiation hydrodynamics. Of course, there are circumstances when a large quantity of radiation is present, yet can be ignored without causing the model to be in error. This happens when radiation from an exterior source streams through the problem, but the latter is so transparent that the energy and momentum coupling is negligible. Everything we say about radiation hydrodynamics applies equally well to neutrinos and photons (apart from the Einstein relations, specific to bosons), but in almost every area of astrophysics neutrino hydrodynamics is ignored, simply because the systems are exceedingly transparent to neutrinos, even though the energy …

Transcript of an interview with with Dr. Janell Myers, counselor, concerning her recollections of the Texas International Pop Festival, in Lewisville, Texas, Labor Day Weekend, 1969. Myers discusses her conservative family background in Dallas, Texas; her attraction to the hippie counterculture as a teenager; hanging out with hippies in Lee Park in Dallas; her college experience at North Texas State University in Denton; her participation in anti-Vietnam War demonstrations and sit-ins; her admiration of singer Janis Joplin; her decision to attend the Texas International Pop Festival; activities of the Hog Farm at the festival; use of drugs and alcohol at the festival; comments about the various rock groups at the festival; activities of "Wavy Gravy"; lasting memories of the festival.