10. 2001: black-ops head­sets now: google glass au­dio

Australian T3 - - TRAVEL -

Bone conduction, which trans­mits sound through the wearer’s cheek­bones rather than through air, was em­braced by the mil­i­tary for its stealth ben­e­fits, en­abling tac­ti­cal troops to hear in­struc­tions with­out way­ward sound giv­ing their lo­ca­tion away. Sim­i­lar tech now graces the faces of Google Glass wear­ers.

US $1,500, google.com/glass

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