Infrared: Heat You Can't See

Anything warmer than absolute zero emits infrared radiation. Your body radiates infrared constantly — you're literally glowing, just not in wavelengths your eyes can detect.

Infrared cameras turn this invisible glow into visible images, with warmer objects appearing brighter. The same technology serves wildly different jobs:

• Military: spotting soldiers and vehicles at night
• Medicine: finding inflammation and circulation problems
• Building inspection: catching heat leaks through walls
• Firefighting: seeing through smoke to locate people
• Astronomy: peering through cosmic dust that blocks visible light.