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What role does human touch play in the digital age?

JUDY WOODRUFF:  Hari Sreenivasan looks at the promise and perils of Silicon’s Valley push into a realm once dominated by government contractors.  HARI SREENIVASAN:  The race for the next big thing is already under way in the private sector.  Companies…  …

Graphene — as thin as an atom and 200 times stronger than steel — is the world’s new ‘wonder material’

Marc Abrahams, editor of Annals of Improbable Research and Guardian columnist, joins Hari Sreenivasan to talk about graphene, the world’s new wonder material. The substance, as thin as an atom, is 200 times stronger than steel. Editor’…  …