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Imaging tests found early signs of cardiovascular disease in two-thirds of a sample of otherwise healthy firefighters. The test subjects, average age 46, had all passed the standard assessments for heart disease risk factors. The study indicates a need for more sophisticated screening of firefighters, who have a disproportionate risk of heart disease. Learn more.

Astronauts on long deep-space missions will be outside the protective radiation shield of the Earth's magnetic field. Rats exposed to the sort of high-energy particles that will bombard space crews developed lapses in attention and delayed reaction times. Cognitive impairments in the astrorats appeared to be linked to protein changes in the brain. Learn more.

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