Humans cannot see infrared light, but some creatures can (like snakes, beetles, and the Predator). If you want to be more like the Predator, there's always the Seek Thermal Camera, which is a fun little gadget that plugs into the USB port on your phone or tablet to give it real time thermal vision. It's usually $249, but now it's down to just $189.54 on Amazon.
Infrared radiation sits below visible light on the electromagnetic spectrum and can be used to detect objects emitting heat.
[Deal Alert] Seek Thermal Camera On Sale For $189.54, Down From $249 was written by the awesome team at Android Police.
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