The top 10 candidates, as determined by Fox's analysis of polls, will debate Thursday. But even when you average polls together, it's tough to tell the difference between the lower-ranked hopefuls.
Joseph Straus, 6, rides a zip line at the Berkeley Adventure Playground, where kids can "play wild" in a half-acre park that has a junkyard feel.
This half-acre of dirt and quirky chaos in California is among the most innovative and creative places for kids to play in the U.S. Grab some wood and nails; it's hammer time.
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Laws in Montana, Utah, North Dakota, Missouri, Kansas, Iowa and North Carolina have also made it illegal for activists to smuggle cameras into industrial animal operations.
A judge ruled Monday that an Idaho law criminalizing undercover investigations of farms is unconstitutional. Seven other states have similar laws, but legal experts say they may not stand much longer.
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Perot speaks at the U.S. Capitol in the spring after the 1992 election.
Maureen Keating via Library of Congress
A group of young Sudanese women performs "girls' music" using overturned kettles and buckets as percussion in the documentary Beats of the Antonov.
Hajooj Kuka/Courtesy of "POV"
From a hard-hitting documentary that delves into deep questions of cultural identity in Sudan to a parody of Indian club anthems, there's something for everyone.
Jim and Lyn Schneider installed solar panels and batteries because bringing grid power to their house in central Wyoming was going to cost around $80,000.
Leigh Paterson/Wyoming Public Radio
The ability to store energy could revolutionize the way electricity is made and used. But for many utility companies and regular folks, energy storage is still too costly and difficult.
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Pep is featured in the Dec. 26, 1925 issue of the Boston Daily Globe. But Gov. Pinchot's wife, Cornelia, later set the tall tale straight in an interview with The New York Times.
The Boston Evening Globe / Courtesy of Boston Public Library
He killed the Pennsylvania governor's wife's cat — or so the story went. As it turns out, the Labrador was sentenced to the grim corridors of Eastern State Penitentiary to live up to his name.
A worker at Ford's assembly plant in Wayne, Mich., installs back seats made from soy-based foam in a Ford C-Max.
Corporate sustainability reports help measure firms' ecological footprints. Ford, for example, touts renewable materials in its cars. But some environmentalists say the reports can be misleading.
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A neighborhood in Rantoul, Ill., offers older adults a break in rent in exchange for six hours a week helping families with adopted foster kids. And the model is catching on.
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Joseph Severn's portrait of Percy Bysshe Shelley. The radical 19th century poet practiced the politics of the plate. For Shelley and other liberals of his day, keeping sugar out of tea was a political statement against slavery.
In 19th century Britain, keeping sugar out of tea became a political statement against slavery. The sugar boycott was no easy choice for the radical writer, who hated slavery but loved tea.
Dr. Dre releases his first album in 16 years, Compton, on Aug. 7.
Chelsea Lauren/Getty Images
He gave us Snoop Dogg, Eminem and Kendrick Lamar. Now, the producer has a new crop of protégés.
President Obama's environmental plan won't be so hard for states that have moved to cut emissions. But for others it will be more difficult.
Scott Olson/Getty Images
The federal rules will deal a big blow to some energy sectors — especially coal. The change won't be so hard for states that have moved to cut emissions. But for others it will be more difficult.
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It may be August, but in the office it feels like January. And there's a mysterious man to blame.
Neil Webb/Getty Images/Ikon Images
Air conditioning standards are based on the needs of a 155-pound man. Researchers say it's time to admit that women don't need to be chilled as much and crank up the thermostat.
It's the heat that straightens the hair. But too much, and hair can be permanently limp, or burned.
Heat can turn curly locks into a sleek 'do — and can also damage hair permanently. Engineers at Purdue are figuring out how hot is just hot enough when it comes to wielding that flat iron.
William Schimmel distills Mahler's lengthy Ninth Symphony down to under seven minutes.
Illustration by Joan Chiverton
Accordionist William Schimmel creates a daring yet touching six-minute distillation of Mahler's mighty Ninth, with detours for tango and trumpet solos by Wynton Marsalis.
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"Anytime you're in the wild with a beautiful animal you're going to feel good," says Susan Casey, author of Voices in the Ocean: A Journey into the Wild and Haunting World of Dolphins.
Penguin Random House
In her new book, Voices in the Ocean, Susan Casey describes the life of dolphins and details some new threats the animals face, such as organized dolphin kills and man-made sounds in the ocean.
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Isis Wenger, an engineer at OneLogin, responded to critics and Internet pundits with a hashtag campaign that shows the diversity of tech.
After being surprised by online responses to her appearance in a recruiting ad, engineer Isis Wenger wanted to see if others felt like they didn't fit a "cookie-cutter mold."
Newbery Medal-winning author Rebecca Stead says her latest, Goodbye Stranger, is about love and how it helps a trio of seventh-grade girls stay friends through the challenges of middle school.
Tenor Placido Domingo performs the title role in a 1994 performance of Verdi's Otello at the Metropolitan Opera in New York.
Johan Elbers/The LIFE Images Collection/Getty Images
The Met says it is committed to "colorblind casting" and that its production of Otello this fall will be the first without dark makeup since the opera was first seen at the company in 1891.
All those folks who think they can invent whatever claims they want about climate change, vaccines or evolution are like Martin Sheen trying to sell Centrum Silver on TV, says Adam Frank.
Ronald Engberson served a short stint in the Marines in 1979. Until recently, he had been homeless the past 10 years.
In 2009, then-Veterans Affairs Secretary Eric Shinseki declared that all homeless veterans would have housing by 2015. New Orleans has made big strides in helping people like Marine Corps veteran Ronald Engberson get off the street. See how other cities measure up.