@SusanLeifker I also got tripped up by this. In hindsight, you could argue it was only eradicated in the polluted industrial cities, but not elsewhere. Leaving a way for the diseases to come back I guess? That' the only way I can make sense of it.

Group 4 now includes "never," which was omitted in the original introduction of the group 4 indicators...add to group 4 intro so the follow-up lesson makes more sense.

Why not include the word "never" in the group 4 indicator list if it is used in 2/5 times in the follow-up examples? I find it to be rather frustrating - after being told to "look for these indicator words" - that almost half don't even use said indicator words lol.

@Hanifa i also find this to be rather frustrating. I would like to build upon the skills just learned, not be tricked into realizing it's an old skill. I get the test will be tricky on purpose, but why make the skill building tricky for a concept just introduced?