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Home » Why Is It? » Page 2

Why Is It?

Why Are Plants Green?

January 24, 2018

The dominance of green chlorophyll on Earth may have come after a more purple period.

Read moreWhy Are Plants Green?
Green and Purple-dyed blood cells

Living Cells

January 18, 2018

You probably have heard that hair is made up of dead cells. But are living cells really "alive"?

Read moreLiving Cells
Girl holding her head, with hands on her jawline

Wisdom Teeth

January 17, 2018

Why do we get wisdom teeth if they often don’t even fit in our jaws?

Read moreWisdom Teeth
Woman outdoors, with hands warming nose and face

Cold Noses

December 15, 2017

A listener asks: Why does your nose run when it’s cold outside?

Read moreCold Noses
Sick-looking person holding tissue up to nose

24-Hour Colds

December 7, 2017

Why you sometimes feel a cold coming on, only to have the symptoms disappear the very next day.

Read more24-Hour Colds
Snowy hillside with snow-covered trees

Snow White

December 1, 2017

A listener asks: What makes snow white?

Read moreSnow White
Craggy, cloudy mountains

Mountain High

March 9, 2017

Have you ever been to a high altitude and found yourself gasping for breath? One listener asked why …

Read moreMountain High

Brilliance Stereotypes

January 30, 2017

Gender stereotypes about extreme intelligence take hold in the early school years.

Read moreBrilliance Stereotypes

Crowd-sourcing Better Tomatoes

January 27, 2017

Researchers turn to panels of taste testers to identify key flavor chemicals lost during the past …

Read moreCrowd-sourcing Better Tomatoes

Germy Fabrics

January 26, 2017

Objects like blankets and stuffed animals can theoretically spread illnesses, but it’s unlikely.

Read moreGermy Fabrics
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