Posted Fri Jul 8, 2011 06:01 PM ET | 0
Scientists craft an artificial windpipe from the patient's own stem cells. Read more

Posted by Emily Sohn Fri Sep 11, 2009 11:59 AM ET | 0
It's that time of year again when billions of birds fly thousands of miles from breeding grounds in the north to warm winter homes in the south. During the day, the study found, the birds maintained an average temperature of about 42.5 degrees C. Read more

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