The philosopher Peter Singer speaks about climate change and our obligation to future generations:
'I'm interested in changing the culture of what we regard as a requirement for living a minimally decent, minimally ethical life.'
(11 mins in)
Longest known comet tail stretched for over a billion kilometres
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NASA's Cassini spacecraft crossed paths with the elongated tail of a comet
in 2002, picking up hydrogen ions from over a billion kilometres away
45 minutes ago
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