Cool:  Russian meteor shock wave went round the world twice.

Ol’ Robbo loves reading about this sort of thing for the same reason he loves to read about geologickal history and meteorological phenomena.  It gives one a delightfully difference sense of perspective.

By way of comparison, if I recall correctly without looking it up, the shock wave from the explosion of Krakatoa back in the 1880’s (?) circled the globe somewhere in the neighborhood of ten times.