His venture, Bigelow Aerospace , is using technology originally developed by NASA to develop inflatable habitats, each one of which could be shipped into space, blown up to about the size of a three-bedroom house and connected to a structure such as the International Space Station.

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These have two hulls, spaced widely apart and connected by a raftlike structure and no large keel.

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This finding is in line with modern thinking that a lot of evolutionary change is connected with regulatory elements rather than actual protein structure.

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The existing structure, like many in the region, was a hodgepodge, with a three-story house connected to a barn.

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