Asteroid approaching Earth; Laughing gas; Invisible UFOs' and Giant faces in Maya temple

• Asteroid the size of city block to approach Earth on July 22

http://www.phenomenica.com/2012/07/asteroid-the-size-of-city-block-to-approach-earth-on-july-22.html

• Laughing gas may have caused the end of Ice Age

http://www.phenomenica.com/2012/07/laughing-gas-may-have-caused-the-end-of-ice-age.html

• 'Invisible' UFOs filmed in infrared

http://www.unexplained-mysteries.com/viewnews.php?id=230531

• Maya temple with giant faces discovered

http://www.unexplained-mysteries.com/viewnews.php?id=230529