Blood
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Science
How a See-Through Frog Hides Its Red Blood From Predators
The glass frog’s unusual adaptation to bolster its camouflage could offer clues for preventing deadly blood clots in people.
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World
Her Baby Needs Heart Surgery. But She Is Demanding ‘Unvaccinated’ Blood.
New Zealand’s health service is seeking to take temporary custody of a critically ill infant so it can perform a lifesaving operation.
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News
F.D.A. Considering New Approach to Blood Donation by Gay and Bisexual Men
The agency may put in place a personalized risk assessment to replace the current prohibition on men who have had sex with men in the previous three months.
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Newyork
When He Stood Up Quickly, He Sometimes Fainted. What Was It?
The attending physician, a doctor for 45 years, had never seen the obscure problem causing these symptoms.