Each of $A$, $B$, $C$, $D$, $E$, and $F$ knows a piece of gossip. They communicate by telephone via a central switchboard, which can connect only two of them at a time. During a conversation, each side tells the other everything he or she knows at that point. Determine the minimum number of calls for everyone to know all six pieces of gossip.
To determine the minimum number of calls required for everyone to know all six pieces of gossip, we can break down the problem into two parts: proving that 9 calls are sufficient and proving that 9 calls are necessary.

1. **Proving 9 calls are sufficient:**
   - Let's denote the six people as \( A, B, C, D, E, \) and \( F \).
   - Initially, each person knows only their own piece of gossip.
   - Suppose \( A \) calls each of the other five people in turn. After these 5 calls, \( A \) knows all 6 pieces of gossip.
   - The last person \( A \) calls, say \( B \), also knows all 6 pieces of gossip because \( A \) tells \( B \) everything in the last call.
   - Now, \( A \) and \( B \) both know all 6 pieces of gossip.
   - \( A \) can now call each of \( C, D, E, \) and \( F \) again, telling them everything. This requires 4 more calls.
   - Therefore, the total number of calls is \( 5 + 4 = 9 \).

2. **Proving 9 calls are necessary:**
   - After \( n \) calls, each person can know at most \( n+1 \) pieces of gossip.
   - There are at most two people who can know \( n+1 \) pieces of gossip after \( n \) calls.
   - To get all 6 pieces of gossip known by one person, it takes at least 5 calls.
   - Suppose the first person to know all 6 pieces of gossip is \( A \) at time \( t \). Before this, no one knows all 6 pieces of gossip.
   - \( A \) must have talked to someone (say \( B \)) to obtain the last piece of gossip. Hence, only \( A \) and \( B \) know all 6 pieces of gossip at time \( t \), implying \( t \ge 5 \).
   - After \( t \), every call can inform at most one other person about all 6 pieces of gossip.
   - Therefore, it takes another 4 calls to inform \( C, D, E, \) and \( F \), resulting in a total of \( 5 + 4 = 9 \) calls.

Thus, the minimum number of calls required for everyone to know all six pieces of gossip is 9.

The final answer is \( \boxed{ 9 } \).