The personal perfume of skin oils
Chapter 1

The architecture of our outer shield

Chapter 2

The evolutionary rainbow of human pigment

Chapter 3

A bustling microscopic wilderness

Chapter 4

The magic of self-repair and healing

YOUR GOAL

Master of The biology of human skin

Ch 3 · A bustling microscopic wilderness
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artiteacher The tiny tenants on your forehead

Jul 11

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artiteacher A bustling microscopic wilderness

My tiny world, my tiny world / Living on my skin!

Jul 10

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artiteacher The invisible shield of friendly bacteria

Jul 11

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The acidic moat of our defenses

artiteacher The skin maintains an acidic surface to deter harmful bacteria and fungi.

Jul 10

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The invisible shield of friendly bacteria

artiteacher Trillions of beneficial microbes on the skin prevent infections by outcompeting pathogens.

Jul 10

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A bustling microscopic wilderness
BETA

artiteacher Match friendly and harmful microbes to discover the bustling microscopic wilderness on your skin.

Jul 10

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Fun Fact

Face mites: Almost every adult human has microscopic, eight-legged Demodex mites living in their eyelash and nose hair follicles.

Jul 10

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Glossary
microbiome (noun)
The community of microorganisms, including bacteria, fungi, and viruses, that inhabit a particular environment. Human skin hosts roughly one million bacteria per square centimeter to protect the body from external pathogens.

Jul 10

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Gossip

How do you feel about your microscopic eyelash mites?

Jul 10

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Quiz

Where on the human body is the density of oil-producing sebaceous glands the highest?

Jul 10

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artiteacher The acidic moat of our defenses

Jul 11

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Quiz

What microscopic, eight-legged arachnids live naturally in human facial hair follicles?

Jul 10

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artiteacher The personal perfume of skin oils

Jul 11

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Quiz

What is the average pH range of the human skin's protective acid mantle?

Jul 10

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Quiz

Which oily substance is produced by glands in the skin to waterproof and lubricate it?

Jul 10

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Quiz

What acidic component of sweat helps maintain the protective barrier of human skin?

Jul 10

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Quiz

Which bacterium is a helpful, dominant resident of healthy human skin that fights off pathogens?

Jul 10

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Quiz

How does washing skin with harsh alkaline soaps affect the skin's natural defense barrier?

Jul 10

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Quiz

What is the collective term for the trillions of bacteria, fungi, and viruses living on human skin?

Jul 10