News
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Health & MedicineHunger hormone gone awry?
People with an inherited form of obesity caused by constant hunger pangs have higher-than-normal blood concentrations of ghrelin, a hormone believed to boost appetite.
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PhysicsTwice-charmed particles spotted?
Exotic cousins of protons and neutrons known as doubly-charmed baryons may have made their laboratory debut.
By Peter Weiss -
AgricultureKiller bees boost coffee yields
Even self-pollinating coffee plants benefit substantially from visits by insect pollinators.
By Janet Raloff -
Caregivers take heartfelt hit
Older persons experience elevated systolic blood pressure for at least 1 year after a spouse with Alzheimer's disease enters a nursing-care facility or dies.