If you have access to his iPad, you can go through the menus to delete your account from it. I don't have an iPad with me at the moment to check, but it's similar to an iPhone. To delete accounts off an iPhone, start the "Settings" app, choose "Mail, Contacts, Calendars", and it will have a list of accounts that have been saved.
Choose the account that you want to remove. It will have a red "Delete Account" button at the bottom. Just push that and confirm.
If you don't have access to his iPad, you can change your e-mail password and then his ipad will no longer have access, but it will still have a copy of messages that he has already read, because it has a 'cache'. I think it might cache messages every time that it checks the inbox, even if you haven't opened the messages, but I'd have to check on that. Anyway, the ideal thing is to delete it off the iPad also instead of only changing the password.
Yes, you need to go into your Account settings within Yahoo and change your password. That way he will no longer be able to access your emails.
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.