Photo credits 5-9

6. "Purple Lightning" US National and Atmospheric Administration. June 4, 2002.
<http://gimp-savvy.com/cgi-bin/img.cgi?noaawYgCbfpmbVY2466>

7. "Big Lightning" US National and Atmospheric Administration. June 4, 2002.
<http://gimp-savvy.com/cgi-bin/img.cgi?noaagn758Rydl257>

8. "Cloud Lightning" US National and Atmospheric Administration. June 4, 2002.
<http://gimp-savvy.com/cgi-bin/img.cgi?noaagjn758Rudl257>

9. "Cloud" US National and Atmospheric Administration. June 4, 2002.
<http://gimp-savvy.com/cgi-bin/img.cgi?noaaD0XwM3829w211736>