impossible : become almost immortal to change order of the earth and make it better place
realistic : living healthy decent life both in this world and after world (hopefully both happens)
Impossible: Make everyone in the world listen to John Lennon and just chill the **** out. Love and peace! And damn good music.
Realistic: Hang out with Noel Gallagher and have him play for me. And then whatever happens in the hotel room happens.