The site is organized by tabs across the top. The topics cover a large variety of subjects.
One thing I have done in the past, to use interactive sites like these, is to create QR codes for the sites. I then place the QR code at the top of a piece of paper with a few questions that students could answer after viewing the site. Students scan the QR code with the Quick Mark download and then answer the questions.
Take a look at some of the great opportunities from this site: