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September 13th, 2011
08:09 PM ET

"The Revealer" clue number 2

Yesterday, we gave you the first in a series of video clues for this Thursday's segment of "The Revealer". Click on the video, get the clue and make your guess here in the “Comments” section.

If you’re first with the right answer, we’ll announce your name live on BackStory when the segment debuts.


Filed under: backstory • The Revealer
soundoff (5 Responses)
  1. Fernando Araújo

    It`s Machu Picchu.

    September 13, 2011 at 8:20 pm | Report abuse |
  2. Marina

    Machu Picchu

    September 13, 2011 at 8:28 pm | Report abuse |
  3. murphy brown

    I like it there are doing a nice work

    September 14, 2011 at 12:07 am | Report abuse |
    • Graziella

      Wow! I'm impressed.Just to chime in, in my ercexienpe "volunteers" are students (if the research is conducted in an academic setting or on a campus) or people culled from the general population via ads in newspapers, etc. I see these all the time in our daily paper here. I've heard that some people "volunteer" for medical research for a living, but can't really back that up with any facts that I know of. I can't help but wonder what confounding variables these kinds of "volunteers" bring to a study.Also, the subject populations are often small. Many studies you'll see quoted all the time in general media are based on, for example, 12 Harvard undergraduates, who were required to volunteer for the subject "pool" if they majored in any social science.

      July 24, 2012 at 5:09 pm | Report abuse |
  4. Sophia Immken

    Too late, but I also think it's Machu Picchu!

    September 14, 2011 at 5:48 pm | Report abuse |