The site is visually compelling--I have been unable to locate much mathematics, however. There are a few exceptions within the World of Mathematics. The top thr

The site is visually compelling--I have been unable to locate much mathematics, however. There are a few exceptions within the World of Mathematics. The top three entries under Symmetry and Space and the panel on sequences under Numbers and Patterns contain some content. Nevertheless, the little content available and the classroom activities PDFs display a transcendent level of professionalism, a superior technical mastery of apparently every aspect of digital publication and an infallible mathematical aesthetic sensibility. The placeholders look promising. What would be most useful to me is know-how: I would like to know how to produce impressive graphics and video presentations at this level. Oops: typo in the sequences panel. "Nowbody knows whether 3003 appears more than eight times, or whether there are any other numbers appearing eight or more times. This is known as Singmaster’s conjecture, named after the American mathematician David Singmaster (1939)." Rewrite the last sentence, given the audience. State the corect conjecture in full--don't say 'this', especially when the preceding sentence is a disjunction, no disjunct of which is a conjecture. The conjecture isn't whether 3003 appears eight or more times. If this is intended as "3003 occurs eight or more times" then it is not Signmaster's conjecture. The reader would not know that the conjecture is the existence of a uniform bound on all the occurrences of numbers in Pascal's triangle other than 1. The statement as it stands contains misleading extraneous cognitive load and must be corrected--there is too much to learn. Give the reader good examples to build upon. The reader can supply his or her own conceptual ambiguities while attempting to manage the cognitive load of the subject. The success of the site will largely depend on how well it manages extraneous, intrinsic and germane cognitive load.