With Yahoo's new format---you can ONLY change (edit) an email you are going to reply to (or forward)--IF--you first disable "Conversations" in your settings. That setting won't allow you to delete (or add) anything. To disable "Conversations"----hover over the "Gear" icon (top right) and in the drop menu, click on "Settings".
Then click on "Viewing emails" (list on the left) and un-check "enable Conversations". Then click "Save". NOW--- It's really easy to erase the previous history.
You have to click on "forward" first----then highlight those previous address and/or previous responses (and/or anything else you don't want)---and then press the delete key on your KEYBOARD , and they are erased. Mostly it's better to only do small bunches at a time, so as not to overwhelm the delete action. For smaller areas,(or stubborn areas) you can just backspace them out---and you don't even have to highlight for that.
When you get it all like you want---click send and the edited copy is sent to your recipients.
Sorry- your method deletes the entire message. I'm switching to Google Mail!
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.