The Energy and Climate Change minister Ed Miliband was live-blogging at the Guardian this morning. One questioner asked about David Mackay's new book Sustainable Energy - Without The Hot Air. Miliband replied:
'MacKay's a smart guy. His book is by my bedside and my permanent secretary keeps telling me I have to finish it!'
Keep reading, Ed.
(My article about MacKay's book says: 'It's geek heaven: full of killer stats that you immediately want to pass on'.)
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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