<a href="http://ycombinator.com/newsguidelines.html" rel="nofollow">http://ycombinator.com/newsguidelines.html</a>
'Please submit the original source. If a blog post reports on something they found on another site, submit the latter.'<p>Also, there is nothing 'secret' about these - they appear to be an entirely natural phenomenon.
More scientific but there is a paywall: <a href="http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo1977.html" rel="nofollow">http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo19...</a>