Virginia Tech, Wake Forest University announce a youth football publication & new head impact study

http://www.eurekalert.org/pub_releases/2012-02/vt-vtw022112.php

/ Virginia youth football kinematics /

What's 6 miles wide & can end civilization in an instant?

Answer: an asteroid

OK, arguably, meteor or meteorite*.

Informative & funny: How to defend Earth from asteroids. See it at:

http://www.ted.com/talks/phil_plait_how_to_defend_earth_from_asteroids.html

There's an iPad app for this, & other, interesting stuff:

http://itunes.com/apps/tedconferences/ted

* An asteroid (or any other fast moving space object) becomes a meteor (aka falling star) when it enters the Earth's atmosphere.  If it hits the ground, it becomes a meteorite.

Legendary tech entrepreneurs: who made the biggest impact on society?

http://www.theatlantic.com/technology/archive/2011/11/legendary-tech-entrepreneurs-who-made-the-biggest-impact-on-society/249053/