If you know of any good studies, please mention them in the comments.

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And there was no mention of legalising gay marriage, which will please some Conservative backbenchers who have criticised it as a distraction from fixing the economy, but the Home Office said it remained committed to introducing same-sex civil marriage "by the end of this Parliament" and a consultation was "still ongoing".

BBC: UK Politics

Note to other ARPA-E attendees: please let me know if you hear of outside-the-box energy ideas, or mention them in the comments.

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