June 30, 1908: A Very Close Encounter of the Second Kind | This Day In Tech | Wired.com

June 30, 1908: A Very Close Encounter of the Second Kind | This Day In Tech | Wired.com: "Based on later assessments of the damage, the force of the blast was estimated to be between 10 and 15 megatons of TNT, roughly a thousand times more powerful than the atomic bomb that destroyed Hiroshima."