With his silver-gray hair tossed behind his ears, he makes quick gestures to illustrate his points.

WSJ: The Weekend Interview with Michio Kaku: Captain Michio and the World of Tomorrow

Her snow boots kicked off, the petite 33-year-old expert on the Internet and youth is wearing a loose tan sweater, dangly silver jewelry and a trademark fuzzy hat that resembles the ears of a white Pomeranian puppy.

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