I also found the double-tap-to-delete counterintuitive. If a single tap expands a node, then a double-tap should open the article. Tap-and-hold to delete is a b

I also found the double-tap-to-delete counterintuitive. If a single tap expands a node, then a double-tap should open the article. Tap-and-hold to delete is a bit more intuitive, too -- it's the same gesture you'd use on your iOS home screen to delete an app. That said, this is a beautiful app!