The wallet-sized card threatens legal action against any doctor who seeks to withdraw food or fluid to end the carrier's life.

BBC: Right to die: the reaction

The fork uses a high-end accelerometer from Analog Devices to measure any shocks and jolts, as well as an advanced fluid-control system from Enfield Technologies that allows the fork to stiffen or soften quicker than a tire can deform, typically between 8 and 13 milliseconds.

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