The site has information scrunched into one corner of the screen, making it somewhat hard to read and less attractive. I checked it using both Chrome and Firefox. The display is somewhat better in Firefox, but still does not make effective use of the entire screen display.
Some of the exercises seem a bit irrelevant, or at least the relevance is not clear, such as in the "Group Similar Ideas Together" section, where part of the exercise has one mouse over pictures to see which are related. "Dog" and "Dog House" are not related to one another in the same way that "Sled" and "Snow Board" are related.
The text-only version is not very engaging.