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A Slovenia-based firm Lisca invented a heat sensitive Smart Bra that alters its shape when the wearer's body temperature changes. This happens when a woman gets flushed after seeing someone attractive.
This means you can find out instantly if you look attractive to someone or not. How? You should just monitor his or her body temperature.
All you need is a handy device for remote monitoring of human body temperature, similar to that used by air hostesses to detect fever suspects among passengers.