"Nothing is impossible"
I'd like to formally disagree. Several things are impossible just because of wording. It is impossible for it to be both raining and not raining at the same time. (This, of course, assumes you leave it at that and do not tack on details such as "It is raining here, it is not raining over there.")
An example that is unarguably impossible would be: "I am both on Earth, and not on Earth." or "I am both using the computer, and not using the computer."
Prof. Aikido signing off.