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There's about 1.5 tons of air pressing down on each of us, yet we push it aside without noticing. Gabrielle Walker explores our atmosphere, the ocean of air on which we all depend. Show more
Gabrielle Walker explores how Earth's atmosphere both sustains and destroys life and discovers surprises in how it does so. Show more
Gabrielle Walker investigates how the thin veil of our atmosphere protects life on Earth from the hazards of deep space. Show more