Patent Law changes today! The change makes the distinction that the "first to file" is the owner vs.the "first to invent".

From the PatenlyO blog:
http://www.patentlyo.com/patent/2013/03/the-new-law-effective-today-35-usc-102.html#comments

For the "Plain English" version see:
http://gigaom.com/2013/03/18/first-to-file-patent-law-starts-today-what-it-means-in-plain-english/

What are sinkholes? Want answers?

see the recent post from the USGS about sinkholes at:
http://www.usgs.gov/blogs/features/usgs_top_story/the-science-of-sinkholes/?from=title