Mick Ebeling: The invention that unlocked a locked-in artist

The nerve disease ALS left graffiti artist TEMPT paralyzed from head to toe, forced to communicate blink by blink. In a remarkable talk at TEDActive, entrepreneur Mick Ebeling shares how he and a team of collaborators built an open-source invention that gave the artist -- and gives others in his circumstance -- the means to make art again.

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S2011E23 - David Christian: Big history