A scientist correctly predicts atomic war and develops a force field to remain behind. His calculations of its duration are incorrect, however, as he believes the war will last twenty years when it only lasts for months. After twenty years he emerges from behind his force field to learn that a serum has been developed to allow people to live for a thousand years but it has no effect on anyone over thirty.
An alien from a methane world learns the habits of earthmen to spy upon them for an upcoming invasion. When he returns to his world to give his report, he automatically strikes a match to light a cigarette while waiting.