No More Sell-By Dates: These Cameras 'Sniff' Out Rotten Food And Could Soon Wipe Out Disease

How can you tell if an avocado's gone bad just by looking at it? By examining it through a hyperspectral (HS) camera. These devices - also known as imaging spectrometers - see things the human eye cannot by scanning the world across multiple channels of light. Where humans see three wavelengths in the colour spectrum (red, green and blue), hyperspectral sensors can detect as many as 480.