On a large, flat field $n$ people are positioned so that for each person the distances to all the other people are different.  Each person holds a water pistol and at a given signal fires and hits the person who is closest.  When $n$ is odd show that there is at least one person left dry.  Is this always true when $n$ is even?
1. **Understanding the Problem:**
   We have \( n \) people positioned on a flat field such that the distances between any two people are distinct. Each person aims and fires at the person closest to them. We need to show that if \( n \) is odd, at least one person remains dry. We also need to determine if this is always true when \( n \) is even.

2. **Case for Odd \( n \):**
   - Consider the scenario where \( n \) is odd.
   - Each person targets the closest person. Since the distances are distinct, each person has a unique closest neighbor.
   - We can represent this situation as a directed graph where each person is a vertex and there is a directed edge from person \( A \) to person \( B \) if \( A \) targets \( B \).

3. **Graph Representation:**
   - In this directed graph, each vertex has exactly one outgoing edge (since each person targets exactly one other person).
   - If \( n \) is odd, the graph cannot be decomposed into disjoint cycles because the sum of the lengths of all cycles must equal \( n \), which is odd. This implies that there must be at least one vertex that is not part of any cycle.

4. **Existence of a Dry Person:**
   - A vertex not part of any cycle means there is at least one person who is not targeted by anyone else. This person remains dry.
   - Therefore, when \( n \) is odd, there is always at least one person who remains dry.

5. **Case for Even \( n \):**
   - When \( n \) is even, it is possible to arrange the people such that everyone gets drenched.
   - For example, consider arranging the people in pairs where each person in a pair targets the other. This forms disjoint 2-cycles.
   - Since \( n \) is even, we can pair up all \( n \) people without any remainder, ensuring that everyone is targeted and thus drenched.

6. **Conclusion:**
   - For odd \( n \), there is always at least one person who remains dry.
   - For even \( n \), it is possible to arrange the people such that everyone gets drenched.

The final answer is \( \boxed{ n } \) is odd.