Peter Singer warmly endorses Dale Jamieson's new book on environmentalism and ethics:
'The “soccer mom” who drives her kids to sporting events and music lessons seems to be a model of virtue – yet she and millions of other equally virtuous people are, collectively, bringing about climate change. To take account of these large collective-action problems, we need a radically new set of virtues.'
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...
6 hours ago
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