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Link from filkerdave Crisis On US's Earth To Address GOP Continuity Errors. (I'm not a comics fan, and what I have read is more Marvel than DC, but that doesn't really matter. This explains the reference for those who care.)

Rock Basics test (though I admit to some guessing):
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More self replicating machines

http://news.bbc.co.uk/1/hi/sci/tech/4538547.stm (probably not really as interesting as http://staff.bath.ac.uk/ensab/replicator/, since it only self assembles from fairly complex preprepared building blocks).

So we're still a long way having to seriously worry, but (link to larger version):