The pocket appears on the oldest pair of jeans in the Levi's archives, which date to about 1879, Levi's historian Tracey Panek told HuffPost.
In Panek's new book, "The 4 Percent Universe" (Houghton Mifflin Harcourt, 2011), Panek recounts the story of how dark matter and dark energy were discovered.
Explains science writer Richard Panek, who spoke about these oddities of our universe on Monday (May 9) at the Graduate Center of the City University of New York (CUNY) here in Manhattan.
