Picture an animal that has survived all five mass extinctions, shrugs off temperatures near absolute zero, withstands being shot from a gun, and keeps going after a trip into the freezing vacuum of outer space. You would expect an armored apex predator. Instead it is a translucent, squishy, microscopic creature with a clumsy bear-like walk, most likely living in a damp gutter outside your house.

This episode dives into the tardigrade, the water bear, beyond the memes. We unpack its bizarre evolutionary path, the strange mechanisms hidden in its DNA, and why geneticists and science fiction writers are equally obsessed. It matters because these humble creatures hold genuine secrets to DNA protection, extreme endurance, and the absolute limits of life on Earth.

• Why genetics suggest a tardigrade is essentially a disembodied arthropod ...