premise: three people, two men and one woman, are watching a scientist who is looking at something in a microscope. hypothesis: four people are in a room and one is looking at something that is small.
entailment: Anything that fits in a microscope must be small; three people watching a scientist brings the total number of people involved to four; it's highly appropriate to keep a microscope indoors, so it would make sense that this scenario is playing out in a room.