The links here contain animations which visualize certain concepts concerning acoustics and vibration. Some of the topics covered are Sounds and Sources, Sound Waves and Radiation, Wave Phenomena ,Oscillators, Optical Ray Tracing, Human Sight - How the Eye Works. The site provides thousands of volunteers, including top lawyers, doctors, engineers, and scientists, who answer the questions posted at the site.
All answers are free and most come within a day.
Alternative fuels are substantially non-petroleum and yield energy security and environmental benefits. Many alternative fuels are being used today in place of fossil fuels like oil. This website, by US Department of Energy, provides a variety of information on these fuels, as well as links to other resources with more detailed information. Material returned covers diagnostic criteria, treatment regimens, clinical relevance, sites of infection, dosage levels, and adverse reactions. Registration is required and it is free.