The May 2010 issue of Scientific American had an article titled http://www.scientificamerican.com/article.cfm?id=through-neutrino-eyes". I enjoyed the article and read it several times. It made me wonder though - how much energy in the form of neutrinos is passing through any given space? The Wikipedia article on http://en.wikipedia.org/wiki/Neutrino" [Broken] cites a reference stating that there are 50 trillion neutrinos passing through our bodies every second. Is there an estimate of how much energy this is equivalent to?