news @ nature.com - Silicon crystal cooked to perfection - Pure lump of 
<BR>silicon-28 could help to redefine the kilogram.
<BR>Ed: And a beauty it is, perfect ball of schimmering silicium,
<BR><A href='http://www.nature.com/news/2007/070528/full/070528-2.html'>http://www.nature.com/news/2007/070528/full/070528-2.html</a> 
<BR>