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Airs Wednesday, July 6, 2011 at 10 p.m. on KPBS TV

Statistical analyst Nate Silver says humility is key to making accurate predictions. Silver, who writes the New York Times' FiveThirtyEight blog, has just written a new book called The Signal and the Noise.

Former GOP congressional candidate Carl DeMaio has launched a super PAC. What it's up to is anyone's guess.

Around the world, hip-hop gives a voice to the voiceless. Our photo essay spotlights rappers in Senegal, who shout out their frustrations about living in poverty and their dreams of a better future.

"Memory is about the present as much as it is about the past," psychologist Charles Fernyhough writes in Pieces of Light. The book explores the science of memory to figure out what shapes it, how it works and why some things stick with us forever.

They could shoot up to 24,000 feet and maintain that altitude in a long-distance migration across the Himalayas. But it's more efficient for bar-headed geese to soar and dive, scientists find.

There are lots of apps out there that claim to improve your mental health, but precious few have actually been tested to see if they work. Psychologists are starting to give that a try.

Now is the time when Cadbury's colorfully wrapped chocolate eggs hit stores in Great Britain. But the company has changed the chocolate used in the treats, and that's left many Britons "shellshocked."

Daryl Gregory ventures into the murky waters of young adult fiction in Harrison Squared, the story of a boy in a creepily Lovecraftian town, searching for sea monsters and his missing mother.

New film explores how we define being human