Uncovering Dinosaur Behavior

Paleontologist Paul Sereno of the University of Chicago. He recently unearthing Jobaria (Joe-BAR-ee-ah) and Suchomimus (sue-coe- MIME-us) -- two new rivals to Tyrannosaurus Rex in West Africa. They're two of the newest additions to the dinosaur family.

Paleontologist and evolutionary biologist Stephen Jay Gould. Gould is a professor of geology and curator at the Museum of Comparative Zoology at Harvard. He writes columns for "Natural History Magazine" and "Discover Magazine," and has written several books, including the award-winning "The Mismeasure of Man." Gould uses his writing and teaching to illuminate and demystify the scientific method and to provide a historical perspective on science for the layman.

It's estimated that one in 10 women experience endometriosis during their reproductive years, a condition where cells that line the uterus go rogue by moving to other organs, taking root and spreading there, leading to terrible pain. Many women who have the disorder struggle to be properly diagnosed. Bioengineer LINDA GRIFFITH talks about her groundbreaking research into endometriosis.