National Geographic has been driving me crazy with this email popup. I won't be giving them my email, so sadly I will not be reading any National Geographic articles.
I don't see the popu. But I do see an advertisement every 1.5 screens I scroll down. Extremely annoying. Article itself isn't bad though
It just works so well, in fact, that I forget it is there at all, and I am glad to occasionally get these reminders.