input: Write a function to demonstrate how to solve a problem using recursion in Python. The function should explain the concept of recursion, break down the problem into smaller subproblems, and provide an example of how a recursive function calls itself.
  
  assert recursive_explanation()== """Recursion is a powerful technique for solving problems. It involves defining a problem in terms of itself. A recursion problem is solved by breaking it down into smaller problems, until the problem is small enough to be solved directly. The result from a smaller problem can then be combined with the result from the larger problem, until the original problem is solved. In Python, a recursive function is one that calls itself."""
output: def recursive_explanation():
      return """Recursion is a powerful technique for solving problems. It involves defining a problem in terms of itself. A recursion problem is solved by breaking it down into smaller problems, until the problem is small enough to be solved directly. The result from a smaller problem can then be combined with the result from the larger problem, until the original problem is solved. In Python, a recursive function is one that calls itself."""