Extras

Video thumbnail: Science Trek Eyes: Where are your eyes?

Science Trek

Eyes: Where are your eyes?

Where your eyes sit in your head matters.

Eyes: Where are your eyes?

Video thumbnail: Science Trek Eyes: Colorful Eyes

Science Trek

Eyes: Colorful Eyes

Your eyes help you see color, usually.

Eyes: Colorful Eyes

Video thumbnail: Science Trek Eyes: Animal Eyes

Eyes: Animal Eyes

Video thumbnail: Science Trek Eyes: Eye Care 101

Science Trek

Eyes: Eye Care 101

How can you protect your eyes?

Eyes: Eye Care 101

Video thumbnail: Science Trek Geology: Rock 'em

Science Trek

Geology: Rock 'em

What kind of rock is this?

Geology: Rock 'em

Video thumbnail: Science Trek Measure: Mass vs. Weight

Science Trek

Measure: Mass vs. Weight

Mass and weight are different.

Measure: Mass vs. Weight

Video thumbnail: Science Trek Trees: Honor the Trees

Trees: Honor the Trees

Video thumbnail: Science Trek Trees: More Than Just Wood

Science Trek

Trees: More Than Just Wood

Is there part of a tree in your lip stick?

Trees: More Than Just Wood

Video thumbnail: Science Trek Trees: Full Show

Science Trek

Trees: Full Show

Trees are the oldest, tallest and heaviest things on Earth. How do they grow and survive?

Trees: Full Show

Video thumbnail: Science Trek Trees: Why So Colorful?

Science Trek

Trees: Why So Colorful?

Why do leaves have different colors?

Trees: Why So Colorful?

Video thumbnail: Science Trek The Web Show: Trees

Science Trek

The Web Show: Trees

Find out why trees are so important to our environment on this Science Trek: The Web Show.

The Web Show: Trees

Video thumbnail: Science Trek The Moon: Super Moon

The Moon: Super Moon

Video thumbnail: Science Trek Mountain Goats: Mountain Goat Horns

Science Trek

Mountain Goats: Mountain Goat Horns

What can you learn from a mountain goat's horns?

Mountain Goats: Mountain Goat Horns

Video thumbnail: Science Trek Mountain Goats: Foot First

Science Trek

Mountain Goats: Foot First

Mountain goat’s feet have special adaptations that help them climb.

Mountain Goats: Foot First

Support for PBS.org provided by: