An artist's illustration shows lung cancer cells lurking among healthy air sacs. David Mack/Science Source hide caption

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Despite significant advances in neurology and imaging, researchers still don't have simple lab tests for diagnosing patients with mental disorders. Diagnoses are still mostly based on a patient's signs and symptoms. BSIP/UIG via Getty Images hide caption

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A miniature ninja throwing star or a surgical device? The microgripper, shown here coming out of a catheter tube, is activated by body heat. The sharp appendages fold up when the device warms up. Evin Gultepe, Gracias Lab, Johns Hopkins University. hide caption

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The British have long said, "Keep calm and carry on." But the catchphrase may need an update for health care. hide caption

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Doctors used a type of MRI test to look at the blood vessels in the brain of a woman with dystextia. The test confirmed she was suffering from a stroke on the right side of her brain Archives of Neurology hide caption

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