great scientific resource, more applications in physics I think than other sciences

Unless you know what you are looking for, the answers the site gives can be far beyond what you seek or can comprehend! Students might be a little overwhelmed with the generated responses and will need to practice using the site in order to feel comfortable using it in the future. That being said, type in Global Warming and the response you get is a wonderful graph and statistic of temperature measurements over time on the planet.

I think this app is worth the fee, do not like that each major component is a separate fee though and there is some overlap on features between app components.

With respect to problem solving, it would be great if the web site offered a way to show the work without users paying for the Pro service while at school. It does a great job with in-depth explanations instead of just getting answers. However, it provides a wonderful opportunity for extended learning. For an example of extended learning, the students can discover how the program comes up with certain properties of shapes.