The Obama camp was thrown by Sarah Palin's appointment, says Ryan Lizza in a New Yorker podcast, but chief strategist David Alexrod told the Obama staff not to worry, the Republicans had spoilt their story, they couldn't attack the Democrats anymore about inexperience.
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...
4 hours ago
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