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How does a Jellyfish Sting?
Jellyfish's tentacles contain thousands of venom containing stinging cells called Cnidocytes. Jellyfish use them for protection as well as for the capture of a prey.
Cnidocytes are basically small compartments which house mini-needle like stingers. The stinger lies coiled under high osmotic pressure.
Now, when there is a trigger due to an external force, the lid of the stinging cell pops open and sea water rushes in.
This forces the mini-needle like stinger to shoot out, penetrate and finally inject venom into the victim.
This discharge can occur in less than one millionth of a second. This is how a Jellyfish Stings.

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Timecodes
0:00 - How does a Jellyfish Sting?
1:05 - Can jellyfish live forever?
2:10 - Why are fish eating plastic?