title: PyPy -- How can it possibly beat CPython?
body: <p>From the <a href="http://google-opensource.blogspot.com/2010/04/pypy-12-released.html" rel="noreferrer">Google Open Source Blog</a>:</p>
  
  <blockquote>
    <p>PyPy is a reimplementation of Python
    in Python, using advanced techniques
    to try to attain better performance
    than CPython. Many years of hard work
    have finally paid off. Our speed
    results often beat CPython, ranging
    from being slightly slower, to
    speedups of up to 2x on real
    application code, to speedups of up to
    10x on small benchmarks.</p>
  </blockquote>
  
  <p>How is this possible? Which Python implementation was used to implement PyPy? <a href="http://python.org" rel="noreferrer">CPython</a>? And what are the chances of a PyPyPy or PyPyPyPy beating their score?</p>
  
  <p>(On a related note... why would anyone try something like this?)</p>