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Birth

Birth

Season 1 Episode 1
52:30
Pulse

Pulse

Season 1 Episode 2
52:30
Fuel

Fuel

Season 1 Episode 3
52:33
Defend

Defend

Season 1 Episode 4
52:33
Sense

Sense

Season 1 Episode 5
52:33
Human: The World Within Season 1

React

Season 1 Episode 6
52:30
Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
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Human: The World Within

Our Sense of Smell

The experience of smell starts when air molecules meet tiny little hairs in our nasal cavity. These hairs are called cilia, and they trap the incoming fumes so they can be processed.