World's lightest solid: Aerographite (was not photoshopped)

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apologies to redfly, as he is correct (i'm guessing?)

Redfly is correct. Aerogel is the lightest solid, but the title "Aerographite" does describe the image (this is aerographite).

alright, kudos to redfly (applauds)

Just did some more research on this, cause it's actually pretty interesting. In case you care: this picture is actually not of Aerogel or Aerographite, and neither of those are the least dense substance. This is a picture of Aerographene, or Graphene Aerogel, and it IS currently the world's lightest substance. Until 2011, silica aerogel held the Guinness World Record for lowest-density solid, though it was ousted by the even lighter materials aerographite in 2012 and then graphene aerogel in 2013. This field of "lightest materials" is constantly evolving, so within a few years the lightest material has changed several times. To conclude, in order of lightness:
1) Aerographene (Pictured Here)
2) Aerographite
3) Aerogel
Probably more than you'd ever care to know.
- FunStats
Sources:
http://en.wikipedia.org/wiki/Aerographene
http://en.wikipedia.org/wiki/Aerographite
http://en.wikipedia.org/wiki/Aerogel

Aerogel is number two if you are correct about the graphene aerogel