This was covered somewhat at the meetup, but-- there are times when Discovery asks a student to fill in blanks related to a screen that has already been seen.
If the blanks involve coding, that coding might well be gone by the time the next page is visited.
It might be a good idea, from the coding pages, to click on the green square at the top, and “open in a new tab”, for the next screen, or, if and when possible, to refer to the repl.it pages for the necessary code.
If not, then-- it is, in a way, a test of memory anyway, so. . .
(Just my 2 cents. Thanks!)