Joyce E Weaver

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NASA craft discovers heart shape on Pluto as flyby nears

The dwarf planet is also dotted with bright points which may be ice caps, and a mysterious dark shape nicknamed "The Whale."<p>"We're at the 'man in the moon' stage of viewing Pluto," said John Spencer of the Southwest Research Institute in Boulder, Colorado.<p>"It's easy to imagine you're seeing …

Cape Canaveral
Delta Airlines

Scientists Figure Out Why Your Knuckles Crack

Short answer: gas bubbles<p>Whether it’s a nervous habit or done just by accident, most people crack their knuckles every once in a while. But the reason why joints crack at all (and the long-term effects of cracking) has been the subject of much debate in the scientific community. With the help of a …