The topic discussed was the ability of a site, Jellymetrics, to determine the readability level of an article. You could post a doc, an article you found on-line, or any number of things.
Take a look at the embedded GIF below followed by a 55 second video below as to how easy it is to use. Hint - if you are going to look at a long article - it makes sense to shrink your screen to get as much as the article as you can. Or, you could copy and paste the long article by grabbing parts of it at a time.
Any questions please let me know!