This is a collection of three novellas and one short story: 'The Martian Way' (1952) is a story about colonists on Mars who must find another source of water since a Joseph McCarthy-like polititian on Earth is threatening to cut off Earth's supply of water for Mars (the story came out right during the McCarthy problems in the U.S. Senate). 'Youth' (1952) is about two pre-teenagers in a post nuclear-war world who come across some small 'animals' that they wish to take to the circus not realizing that they are intelligent beings who had come to make contact with the youths' fathers. 'The Deep' (1952) is focused on beings who live in the interior of a planet (their sun is dying and the inhabitants keep migrating deeper into their planet for the planet's natural heat) whose social structure considers maternal love to be a taboo and degenerate. They are forced to come into contact with beings (Earthlings) who they regard as obscene due to the presence of this emotion. 'Sucker Bait' (1954) is centered on a world having two suns (the two suns and the planet form a Trojan orbital system of an equilateral triangle). A previous colony of a thousand members had died a hundred years earlier and a new expedition has been sent to discover why. Asimov also suggests in this story that scientists in the future may become so specialized that they will be unaware of basic facts anywhere outside of their specific field. I really doubt that. Anyone who has a love of science has a joy of all science. That will be true in the future as well (However, there will always be people [in any field] who are narrow minded.).