Also to clarify your second and third questions, if you never used the feature on Apollo before, this it how it worked: if you scrolled down anywhere, be it in a comments section or down a bunch of posts and tapped the top of the screen, it would take you to the top of the page, the same way it works in most apps and internet browsers. The magic was that if you tap the top again, you would return to where you were when you first tapped the top of the screen. Which is a feature I have never seen except in Apollo.