Seamus Heaney tells the Guardian, 'Environmental issues have to a large extent changed the mind of poetry ... at this stage nobody can have an uncomplicated Hopkinsian trust in the self-refreshing powers of nature.' (ht. gos)
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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