Miller's specimens were found and subjected to modern testing methods in 2007. The results....
http://news.bbc.co.uk/2/hi/science/nature/7675193.stm
http://news.bbc.co.uk/2/hi/science/nature/7675193.stm
Quote:"We found not only did these make more of certain amino acids than in the classic experiment, but they made a greater diversity of amino acids."
Miller, using the old methods, had found five amino acids; Jeffrey Bada and his teams tracked down 22. What is more, the overall chemical yields were often higher than in the first set of experiments - the mixture appeared to be more fertile.
Professor Bada points out that today, almost all volcanic eruptions are accompanied by violent electric storms. The same could have been true on the young Earth.