S2 Ep4. A hedgehog could save your life! Spiky quills protect hedgehogs from being eaten by predators. But they also play an important role in cushioning the animal when it falls, keeping it safe even if it plunges from a great height. And now, they can help keep humans safe, too. By mimicking the flexibility, strength and pattern of the quills, scientists have developed a sports helmet that could prevent concussions.

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