Following yesterday's announcement that the topic for Blog Action Day on October 15 was 'water', here - as a starter - is the list of companies, plays and productions on our directory database that pops up when you type in 'water'.
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...
9 hours ago
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