littlesparkvt (2707383) writes "Impact of Asteroid 2012 DA14 would hit the Earth with the force of 185 Hiroshima Bombs or 1700 Kilotons. The impact of Tunguska in 1908 destroyed an 830 mile radius, 2012 DA14 would have a similar blast area." Link to Original Source
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"