A supporter holds up a "Women for H" sign while Hillary Clinton speaks at the New Hampshire Democratic Party Convention last weekend in Manchester. When Clinton ran eight years ago, she downplayed the potential historical significance of her candidacy. This time around, she has made so-called women's issues centerpieces of her campaign. Scott Eisen/Getty Images hide caption

The Essure contraceptive device is placed in the fallopian tubes, where it causes scarring that blocks sperm from reaching eggs. Courtesy of Bayer HealthCare hide caption

The seeds of pods from the moringa tree taste like green beans, only sweeter. And they're good for you, too. PHONLAWAT/iStockphoto hide caption

President Barack Obama, and Secretary of Education Arne Duncan, left, discuss college access and affordability at North High School in Des Moines. Andrew Harnik/AP hide caption