Homo habilis & Homo erectus, Kenya

    Whether they are mother-and-daughter species or two sisters, the relationship between Homo habilis and Homo erectus is becoming strained. A pair of discoveries near Lake Ileret in Kenya call into question the idea that H. erectus, the species from which modern humans evolved, is descended from H. habilis, the earliest hominid known to use stone tools.

Greater Angkor, Cambodia

    The capital of a Khmer state that flourished between the ninth and fifteenth centuries, Cambodia's Angkor is one of the most intensively studied sites in the world. But it continues to inspire more questions than answers, the most fundamental being why the sophisticated Khmer Empire collapsed. In 2007, research into the mysteries of the world's largest preindustrial city reached a milestone with the completion of a 10-year mapping project, which yielded clues suggesting that the sprawling metropolis may have collapsed under self-induced environmental pressures related to overpopulation and deforestation.

    (Agencies)

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