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3. There’s a species of jellyfish that can potentially live forever – The Turritopsis dohrnii jellyfish can revert its cells to a younger state after reaching maturity, essentially cycling back to youth indefinitely. 4. Sharks existed before trees – Sharks have been around for over 400 million yea…

3. There’s a species of jellyfish that can potentially live forever – The Turritopsis dohrnii jellyfish can revert its cells to a younger state after reaching maturity, essentially cycling back to youth indefinitely. 4. Sharks existed before trees – Sharks have been around for over 400 million years, while the first trees appeared roughly 350 million years ago. Sharks have literally been swimming the oceans longer than there have been forests on land.