Doctors separate twin girls joined at head in rare surgery
How oxygen-producing pond scum could save your life after a heart attack
Meet the 12 Americans training to be NASA’s newest astronauts
Meteorite date reveals Jupiter to be solar system’s oldest planet
Dutch fishermen discover world’s first two-headed porpoise
Flag Day: What is it and why do we celebrate it?
How astronauts are keeping you healthy from 250 miles up
Google simulator lets you see what the 2017 total solar eclipse will look like where you live
Yahoo-Verizon deal closes. It’s the fall of a giant, end of an era
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