Asteroid crashes; a rare glimpse of Northern Lights; the largest dam by Mayas and 2012 as the end of the calendar cycle.

• Asteroid crashes delivered water on Earth

http://www.phenomenica.com/2012/07/asteroid-crashes-delivered-water-on-earth.html

• Norfolk village given rare glimspe of Northern lights

http://www.telegraph.co.uk/news/newstopics/howaboutthat/9404954/Norfolk-village-given-rare-glimspe-of-Northern-lights.html

• Largest ancient dam built by Maya uncovered

http://www.phenomenica.com/2012/07/largest-ancient-dam-built-by-maya-uncovered.html

• Maya text cites 2012 as end of calendar cycle, not end of world

http://www.phenomenica.com/2012/06/maya-text-cites-2012-as-end-of-calendar-cycle-not-end-of-world.html