Funded by grants from The William and Flora Hewlett Foundation and the National Science Foundation, the Physics Education Technology (PhET) site features many well-designed and engaging physics and chemistry simulations for use in the classroom. Currently, the site offers fifteen simulations, which cover projectile motion, salts & solubility, wave interference, and other related areas. Visitors can run the simulations from their computer, or they can also elect to download them individually. The simulations are all interactive, full of color, and very engaging. Of course, they have also provided a "Teachers Ideas & Activities" area. Here visitor can browse through activities created by educators across the country which are based on these simulations. Visitor can look over the activities by type or grade level, and they can also submit their own activities for inclusion. The site is rounded out by a list of FAQ's and a troubleshooting section.