Extras

Video thumbnail: Science Trek Planets: What is a Moon?

Science Trek

Planets: What is a Moon?

There are lots of moons in the Solar System, but only one Moon. Find out why.

Planets: What is a Moon?

Video thumbnail: Science Trek Planets: How Long Is A Day?

Science Trek

Planets: How Long Is A Day?

How long is a day on Mars and why is it different from Earth?

Planets: How Long Is A Day?

Video thumbnail: Science Trek Planets: Exoplanets Examined

Science Trek

Planets: Exoplanets Examined

What is an exoplanet? Go outside our Solar System and find out.

Planets: Exoplanets Examined

Video thumbnail: Science Trek Planets: Dirty Snowballs and Rocks

Science Trek

Planets: Dirty Snowballs and Rocks

Find out how comets and asteroids changed Earth’s history.

Planets: Dirty Snowballs and Rocks

Video thumbnail: Science Trek Viruses: Are Viruses Germs?

Science Trek

Viruses: Are Viruses Germs?

Germs make you sick. Find out what they are.

Viruses: Are Viruses Germs?

Video thumbnail: Science Trek Viruses: Virus or Bacteria?

Science Trek

Viruses: Virus or Bacteria?

What’s the difference between viruses and bacteria?

Viruses: Virus or Bacteria?

Video thumbnail: Science Trek Viruses: SmallPox

Science Trek

Viruses: SmallPox

How did we rid the world of the Smallpox virus?

Viruses: SmallPox

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: 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 Eyes: Colorful Eyes

Science Trek

Eyes: Colorful Eyes

Your eyes help you see color, usually.

Eyes: Colorful Eyes

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?