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Season 2, episode 2. This player now records resume state for the active profile so browse, account, and detail pages can bring you back here quickly.

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S2 E2

How Much Do You Smell?

Many insects and some mammals use smell as a primary means of communication. NOVA explains how, for example, the entire economy of an ant's nest is organized by smell, and how some moths use smell for population control—an ability we is now beginning to understand.

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Season 2

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Episode 1: Why Do Birds Sing?

Episode 2: How Much Do You Smell?

Now playing

Episode 3: The Hunting Of The Quark

Episode 4: The Secrets Of Sleep

Episode 5: Inside the Golden Gate

Episode 6: The Men Who Painted Caves

Episode 7: Red Sea Coral

Episode 8: War From the Air

Episode 9: What Time is Your Body?