Searching for new sources to explain human variation (p. 18)

Ancient expanses called cratons pose a geological puzzle (p. 22)

Scientists observe Hawking radiation in unexpected materials (p. 28)

Physicists trap antihydrogen for long enough to study the elusive material. (p. 5)

Verbally in-sync conversations may help to start and maintain dating relationships. (p. 8)

Acoustic scientists re-create and analyze sounds from 3,000-year-old shell instruments for insight into pre-Inca civilization. (p. 8)

Bone marks advanced as evidence of stone-tool use to butcher animals 3.4 million years ago may actually have resulted from animal trampling, scientists say. (p. 8)

Radar studies of desert drainage patterns point to ancient oases in the Sahara. (p. 9)

Immediate and substantial action to reduce emissions would be needed to meet climate negotiators' goal of holding warming to a 2 degree Celsius increase, a new package of scientific papers concludes. (p. 9)

Circular patterns in the universe's pervasive background radiation suggest that the Big Bang was not the beginning of the universe, but only the latest of its incarnations. (p. 10)

Using stars as celestial beacons could be a backup if GPS ground stations failed. (p. 11)

Extrasolar planet traces its origin outside the Milky Way to an ancient neighboring galaxy. (p. 11)

Bornean apes went through a genetic bottleneck when isolated during an ancient glaciation. (p. 12)

Hunt for lost frog turns up new species in Colombian rain forests. (p. 12)

Researchers make RNA machines that can change cells’ behavior. (p. 13)

Tunicates’ scrambled gene order suggests that arrangement may not matter for vertebrate body plan and hints at the origins of mysterious DNA chunks called introns. (p. 13)

Anacetrapib raises beneficial HDL while lowering harmful LDL, a medical trial finds, suggesting it may be a powerful new weapon against cardiovascular disease. (p. 14)

Stem cells that are abundant in adipose tissue seem to boost the recovery of heart tissues in people who survive the big one, early research shows. (p. 15)

Having two to three drinks a day was associated with decreased heart problems in men during the three years after the operation, researchers from Italy report. (p. 15)

Atrial fibrillation patients who took capsules rich in omega-3 fatty acids had about as many episodes as those getting a placebo, a study finds. (p. 15)

Already prescribed for severe cases, eplerenone cuts death and hospitalization rates in patients with less severe but chronic forms of the condition, a new study finds. (p. 15)

Computer simulations show that the current military helmet lets explosive forces into the head through the face. (p. 16)

Gay and bisexual men who don’t have the AIDS virus can reduce their risk of getting it by taking a drug combination, a new study finds. (p. 16)

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Review by Susan Milius (p. 30)

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