Elkwood and Tobin use new collagen nerve tubes as fasteners, tucking the fibers of the stringy cavernosal nerve into the tube for easier connection to the sural nerve.

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For days, a tube snaked down to the collapsed cavern was the only connection the miners had to the surface.

CNN: Peru: Nine miners rescued after six days underground

The latter has been winning of late, hence Crossrail, the high-speed connection to the continent, and the upgrades of London's bus and Tube networks.

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"With mobile downloads for BBC iPlayer, you can now load up your mobile phone or tablet with hours and hours of BBC television programmes, then watch them on the road, on the Tube, on a plane, without worrying about having an internet connection or running up a mobile data bill, " said Daniel Danker, general manager of programmes and on-demand for the BBC.

BBC: iPlayer launches mobile-download service