containment dome

(Just a note: The giveaway period for the audiobook of The Poisoner's Handbook has ended. If your comment is not published, it's too late to be considered for a free copy. But still glad to hear your ideas! Winners to be notified on Wednesday). One of the most interesting - and I think important - comment threads on this blog has concerned risks posed by the gas methane, blamed (along with BP) for the devastating oil spill in April and still seeping into the water from the broken drill pipe. "We don't know the composition of the crude oil as it is leaving the well head. This crude is…