Jellyfish are among the oldest creatures on the planet, but also subject to less research than most animals and science is only now catching up.
With no heart, blood, or brain, you’d think they would be simple, but there is more to them than meets the eye.
They have survived five mass extinctions and live in every ocean.
This video from the PBS Deep Look series investigates these ultimate survivors.
Bill Condie is a science journalist based in Adelaide, Australia.
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