Scientific Minds Want To Know
![](http://l.yimg.com/a/i/ww/news/2010/5/25/diver-pd.jpg)
Stunning artifacts knocked into the sea off Alexandria 1,600 years ago are now being retrieved.
Also: THE BIG PICTURE
A famous half-billion-year-old fossil, one of the "weird wonders" from Canada's Burgess Shale, may be a cephalopod
![http://l.yimg.com/a/i/ww/news/2010/05/26/mars.jpg](http://l.yimg.com/a/i/ww/news/2010/05/26/mars.jpg)
Mystery spirals on Mars explained
Researchers discover what carved a pinwheel pattern into the planet's polar ice caps.
Also: ![](http://l.yimg.com/a/i/ww/news/2010/05/27/ardi-pd.jpg)
'Ardi' sparks renewed ancestry debate
The ancient creature may not belong in the human evolutionary tree, a new study suggests.
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