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The new S61 phone by CAT features a Flir thermal-imaging camera. This means you can take photos that show how hot or cold different things are around you.

Sure, it might be a tool designed to help plumbers work out where a blockage in a heat pipe might be, but to us it's an excuse to pretend we're the predator seeking out our enemies in thermal vision.

I took the phone around Barcelona to see what Spain's coolest city looks like through the S61's lens.

First up, this copy of the wonderful CNET magazine on a newsstand. I have no idea why the top is cooler than the bottom.

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A selfie, of course. While my face is hot, the cooler lenses of my glasses stops that heat reaching the camera, resulting in them looking like sunglasses.

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Using thermal vision, you can see the hand heat-print I left on this chair seat. The print is invisible to the naked eye.

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Two Samsung phones, one of which is running a benchmark and therefore warming up more than the other. 

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A man and his dog.

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One of the Canon C100 cameras used by our video production team. 

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Someone browsing the ham selection at Barcelona's La Boqueria food market.

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This fountain in the centre of Barcelona. 

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A cold, rainy day, but the figures walking in the street light up perfectly in thermal vision.

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Using a different colour scheme this time: This hot hand shows up bright red, holding the dark blue block of ice.

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The outside of the Fira convention centre where MWC takes place. Those stands are Google's Android huts.

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A lovely latte.

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Dogs are adorable even in heat vision.

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Figures cross a street at night.

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Shoppers in the food market.

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A hot hand clutches a cold beer.

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I traced the CNET logo onto this stool. The heat left behind by my finger was still visible in thermal mode.

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A Barcelona Metro train.

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Drinkers relax in a bar.

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A hot coffee.

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People sit outside a restaurant. The bright yellow pillars are outdoor heaters.

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Me and CNET's Jessica Dolcourt waving hello.

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