I knew of the existence of Mathematica for the first time in 1990. Then I started using Mathematica 2 on a NeXT computer. I think it was around 1992. Since then, I’ve been using Mathematica for acoustic simulation. I am amazed at the evolution of Mathematica to date. I need Mathematica more and more every time Mathematica is improved. Using Mathematica 9 now, I am going to start the calculation of the propagation of sound, including the effects of temperature and wind. I expect that the use of an acoustic field increases from now.