Can't see the wood for the tree's...
When I reply to an email in Thunderbird that included an attachment, I keep on including the attachment with the reply. This didn't use to happen, I've changed something, probably accidentally, and I can't see what I've done!! nothing in options/attachments seems to help...
Experience; is something you gain, just after you needed it most.
When faced with two choices, simply toss a coin. It works not because it settles the question for you. But because in that brief moment while the coin is in the air. You suddenly know what you are hoping for.