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Embryo stem cells turned to blood
Human embryonic stem cells may provide a new source of blood and bone marrow.
- Health & Medicine
Painkillers may damage hearts
A retrospective study suggests that commonly used painkillers called COX-2 inhibitors may slightly increase a person's risk of having a heart attack.
- Health & Medicine
Placebos are dead, long live placebos
A study provides new evidence for the placebo effect and suggests a mechanism through which placebos might benefit patients with Parkinson's disease.
- Planetary Science
Galileo finds spires on Callisto
The sharpest images ever taken of Jupiter's icy moon Callisto show a group of features never seen before on the remote body—icy, knoblike spires that show signs of slow but steady erosion.
