The first green professional baseball stadium opens today. It has 'energy-saving light fixtures, water-conserving plumbing, drought-resistant plants, and a green roof over the concessions area.'
The first green theatres here.
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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