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We also discuss the phenomenon of symptom-free cases — how many are there, do we know how much of a role they play in spreading the virus?

Knowing where rates of prevalence are highest — and lowest — can lead to new strategies for treatment and prevention. The map focuses on sub-Saharan Africa, the epicenter of the epidemic.

Moammar Gadhafi dominated the country for decades, and replacing his idiosyncratic rule is still a work in progress. It involves everything from removing exhibits at the national museum to revamping the way the oil industry is run.

Moammar Gadhafi dominated the country for decades, and replacing his idiosyncratic rule is still a work in progress. It involves everything from removing exhibits at the national museum to revamping the way the oil industry is run.

If we don't notice that animals are in deep decline, do we keep eating and eating until what is disappearing is gone permanently? Or do we unconsciously adjust?

If we don't notice that animals are in deep decline, do we keep eating and eating until what is disappearing is gone permanently? Or do we unconsciously adjust?

For many Central American migrants crossing illegally through Mexico to the U.S., the journey starts as they hop a freight train. But the already perilous trip is more risky as they now fear kidnapping by Mexican drug cartels. Last year, hundreds of migrants went missing or were killed in Mexico.

Ahmed Alnaouq posts the stories of Palestinians with the organization We Are Not Numbers. Then, he lost over 20 members of his family when an Israeli airstrike hit his family home.

It's been a great year for high-profile comics creators, producing landmark works destined for many "Best Comics of 2012" lists. But what about the lesser-known artists and their work? Glen Weldon points to outstanding works that haven't gotten the attention they deserve.

The grass pea is one: a hardy crop that can thrive in a drought. An agriculturist is spearheading an effort to diversify what farmers grow as climate change threatens staples like corn and wheat.