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Between you and the rest of the world lies an interface that makes up 16% of your physical weight. This is your skin, the largest organ in your body: laid out flat, it would cover close to 1.7 square meters of ground. But besides keeping your organs in, what is its purpose? Emma Bryce takes us into the integumentary system to find out.

Lesson by Emma Bryce, animation by Augenblick Studios.