After spending around 15 minutes fully looking through the site and the links, I can say that this site is pretty disappointing, especially for a topic that I would surmise to be pretty popular. The landing page is essentially only links, which lead to other sites with no real way to navigate back to the landing page. Once you click on a link, you are taken to a different page which seems to cause browser issues. The only real way to approach this site is to open each link in different tabs (or browser windows, if you prefer) to avoid the hassle of navigating through multiple pages and losing your place. Overall, this page is really not very user-friendly, which is a hindrance on judging its content. The content is good, not amazing; the lack of original content is a real downgrade. There is not a lot of information related to Newton's achievements or mathematical studies. Most of the content is in the form of external links, which is mostly just a hassle for any average user, and any student trying to find information about Newton would probably be better off going to a different site.
Very poor layout, links lead to external sites or pages within the site, with no easy way to navigate back to the landing page. Navigation is very poor and content of the page is disappointingly minimal, with very little unique content.
Time spent reviewing site:
15 minutes spent navigating back and forth, trying to maintain the landing page without getting lost (very difficult), and reading through content to find that a user would be better off going elsewhere for information on this topic.