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Chemistry

Leptin leads to hamster baby boom

High levels of leptin may tell mother hamsters to invest in larger litters, a new study suggests.

Health & Medicine

Vitamin D may be heart protective

Vitamin D limits arterial plaque buildup in people with diabetes, early tests suggest.

Life

Excess folic acid sits idle

Humans metabolize folic acid at a slow rate, suggesting that additional folic acid may yield no more benefits than recommended doses do, researchers report.

Space

Extrasolar planets at full tilt

Violent interactions between planets may have played a key role in shaping the architecture of many extrasolar planet systems.