At http://www.scientificamerican.com/article.cfm?id=earth-atmosphere-format… December 2009 … Krypton trapped in earth's mantle may not have been captured from the Sun – as models predict. It seems to have an origin in carbonaceous meteorites or comets and if this is confirmed bang goes the generally accepted theory. The earth's primordial atmosphere could have been derived from solar nebulae, a cloud of dust and gas left over from the Sun's formation – but likewise ti may have an origin in comets or impactors that theoretically could have delivered significant amounts of chemicals to earth during or after the earth's formation.
At http://www.scientificamerican.com/article.cfm?id=splitting-time-from-space/ December 2009 … is about the possibility of toppling Einstein's 'space time', a piece of journalese that is perhaps more hopeful than realistic. It was covered by In the News last year, via Daily Galaxy, and this link was provided by member Gary. The comments at the end of the article are also worth reading.