If some people are biologists and some are policemen, what can we conclude about the overlap?

The conclusion that some people are both biologists and policemen stems from the information given in the question. When it states that "some people are biologists and some are policemen," it suggests that there is a group of individuals classified as biologists and a separate group identified as policemen. Since the words "some" implies that there is a subset or overlap between these two categories, it is logical to conclude that some individuals belong to both professions.

This overlap is a common characteristic in many scenarios where individuals can have multiple roles or identities. In this case, it suggests that there exist individuals who are involved in both biology and law enforcement. Hence, identifying that some individuals can belong to both groups is a reasonable deduction based on the language used in the question, which emphasizes the potential for overlap rather than exclusivity in roles.