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| Philadelphia Science Festival 2012 Crowd at our tent with Mitch, Hank, and Rich Bowers |
Friday, April 20, 2012
Philadelphia Science Festival 2012 Crowd at our tent with Mitch, Hank, and Rich Bowers
Philadelphia Science Festival 2012 Frank O'Brien and some Dow Chemical scientist
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| Philadelphia Science Festival 2012 Frank O'Brien and some Dow Chemical scientists |
Philadelphia Science Festival 2012 Lava Tube display
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| Philadelphia Science Festival 2012 Lava Tube display |
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