California Sutter’s Mill meteorite entered Earth’s atmosphere at 64,000 mph
http://www.slashgear.com/california-sutters-mill-meteorite-entered-earths-atmosphere-at-64000-mph-21261928/
Note that the explosion was estimated to be about a quarter of size of the atomic bomb dropped on Hiroshima. The Tunguska event, for comparison, was estimated to be 10-15 megatons, or 1,000 times the Hiroshima. These things could be quite sever even if they are not ‘dinosaur killers’, yet we spend pennies per person looking for them.
Perhaps that is the Mayan Apocalypse: we get an asteroid upside the head.
