The rock industry takes steps to turn its audience green. Alison Tickell, director of Julie's Bicycle, says:
'What's interesting is that rather than an industry being led by consumer demands which is the usual way change takes place, the industry itself is saying we have to do something.'
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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