I would like to note that today is the one hundredth anniversary of the Tunguska Event . You would be forgiven for having not heard of this event or even any idea of where or what a Tunguska is, but it has fascinated me ever since I read about it in the World Book Encyclopaedia as a kid. As an aside, I will admit to dipping into the old encyclopaedia for random reading matter right throughout my childhood (remember kids this is BE time ( B efore the I nternet). The Tunguska Event was a massive explosion that occurred near the Podkamennaya Tunguska River in (what is now) Krasnoyarsk Krai of Russia during the morning of June 30, 1908. To confuse matters more, we have the lovely quirk of Russian history that records the date as June 17, in the Julian calendar, which was used at the time. Most estimates of the energy of the blast agree on somewhere between ten-to-fifteen megatons of TNT the most likely. This would make it about a thousand times as powerful as the bomb dropped on Hiroshima...