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This blinking T-shirt senses your heart beat and displays it on a heart-shaped LED array. The creators, Heart-felt Robot, said the T-shirt is dry-cleanable but not washable. It runs on three AAA batteries.

Mark Frauenfelder

Mark Frauenfelder

Mark Frauenfelder is the editor-in-chief of Make magazine, and the founder of the popular Boing Boing blog.