Tears are salty because of a mix of salts and potassium in them. Not all tears are the same, your tears are mostly composed of water and have a similar structure to saliva.
Researchers divided tears into 3 different types
basic tears - moisturizing the eye
reflex tears - eye irritation (for example from cutting an onion)
emotional tears - helping to express your feelings
humans produce less tears when they gets older
Girls cry more often than boys
here you can spot different types of tears under potato-microscope
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Dr. SirPotato. I love your articl. It's so much fun!