Ten birds land on a $10$-meter-long wire, each at a random point chosen uniformly along the wire. (That is, if we pick out any $x$-meter portion of the wire, there is an $\tfrac{x}{10}$ probability that a given bird will land there.) What is the probability that every bird sits more than one meter away from its closest neighbor?
1. **Labeling and Segmenting the Wire:**
   - We label the birds from \(1\) to \(10\).
   - We divide the \(10\)-meter-long wire into \(10\) disjoint segments, each of length \(1\) meter.
   - Each bird must occupy a different segment to ensure that no two birds are within \(1\) meter of each other.

2. **Assigning Birds to Segments:**
   - There are \(10!\) ways to assign the \(10\) birds to the \(10\) segments.
   - The probability of any specific assignment occurring is \(\left(\frac{1}{10}\right)^{10} = \frac{1}{10^{10}}\).

3. **Calculating the Probability of Distinct Assignments:**
   - The probability that each bird lies on a different segment is given by the number of ways to assign the birds to the segments divided by the total number of possible assignments:
     \[
     \frac{10!}{10^{10}}
     \]

4. **Positioning Birds within Segments:**
   - Label the segments from left to right as \(1\) to \(10\).
   - For segment \(i\), let \(x_i\) be the distance from the left edge of the segment to the position of the bird on the segment.
   - Each \(x_i\) lies in the range \([0,1]\) and is chosen uniformly at random.

5. **Ensuring Distinct Positions:**
   - The probability that two \(x_i\) are equal to each other is \(0\) because if \(9\) of the \(x_i\)'s are fixed, the tenth has infinitely many possible values and finitely many equal to one of the other \(x_i\).
   - Therefore, we may assume all \(x_i\) are distinct.

6. **Ordering the Positions:**
   - Every pair of neighboring birds is more than \(1\) meter away from each other if and only if \(x_1 < x_2 < x_3 < \ldots < x_{10}\).
   - Since every permutation of the \(x_i\) is equally likely, the probability that \(x_1 < x_2 < x_3 < \ldots < x_{10}\) is:
     \[
     P(x_1 < x_2 < x_3 < \ldots < x_{10}) = \frac{1}{10!}
     \]

7. **Combining Probabilities:**
   - The desired probability is the product of the probability that each bird lies on a different segment and the probability that the \(x_i\) are in sorted order:
     \[
     \frac{10!}{10^{10}} \cdot \frac{1}{10!} = \frac{1}{10^{10}}
     \]

The final answer is \(\boxed{\frac{1}{10^{10}}}\).