This weekend's Observer lists the world's 50 most powerful blogs. Only two of them - Treehugger and Bean sprouts - are green.
The Times has a fairly trad list of the top 50 eco-blogs, which leaves out - for instance - No Impact Man and Casaubon's Book.
Knot theory could help spacecraft navigate crowded solar systems
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It can be difficult to figure out how to move a spacecraft from one orbit
to another, but a trick from knot theory can help find spots where shifting
orbit...
5 hours ago
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