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The Big Why: Micro-World Edition

The Secret Universe Under Your Fingernails

Shrink down to a size smaller than a grain of sand. We’re diving into the invisible kingdom of cells, atoms, and tiny monsters to solve the 'why' behind the world you can’t see with the naked eye.

Science20 Topics • 69 min

Topics

The Invisible Kingdom: Why can't we see germs?
Microbiology4 min

The Invisible Kingdom: Why can't we see germs?

Discover the hidden world of bacteria and viruses that is too small for human eyes to spot.

FREE
The Body's Bricks: Why are we made of tiny cells?
Cell Biology4 min

The Body's Bricks: Why are we made of tiny cells?

Explore the microscopic 'Lego pieces' that build everything from your skin to your brain.

FREE
The White Knight Army: How does our blood fight germs?
Human Defense3 min

The White Knight Army: How does our blood fight germs?

Meet the microscopic soldiers inside your veins that hunt down tiny invaders.

FREE
The Instruction Manual: Why do I look like my parents?
Genetics5 min

The Instruction Manual: Why do I look like my parents?

Unravel the twisted ladder of DNA that holds the secret recipe for 'You'.

FREE
The Building Blocks: Why is everything made of atoms?
Chemistry6 min

The Building Blocks: Why is everything made of atoms?

Shrink down past the cells to find the tiny, buzzing balls of energy that make up the whole universe.

FREE
Leaf Power: How do plants turn sunlight into food?
Botany5 min

Leaf Power: How do plants turn sunlight into food?

Peek inside a leaf to see the microscopic green machines that breathe for the planet.

FREE
The Water Bear: Why is the Tardigrade so hard to kill?
Zoology4 min

The Water Bear: Why is the Tardigrade so hard to kill?

Meet the microscopic 'moss piglet' that can survive in space and boiling water.

FREE
The Training Camp: How do vaccines protect us?
Immunology

The Training Camp: How do vaccines protect us?

Learn how doctors give your immune system a 'cheat sheet' to beat germs before they arrive.

FREE
Ant Superpowers: Why are tiny insects so strong?
Entomology4 min

Ant Superpowers: Why are tiny insects so strong?

Investigate the microscopic muscle fibers that let an ant lift a bus (if it were human-sized!).

FREE
Fingerprint Ridges: Why do we have loops on our skin?
Forensics4 min

Fingerprint Ridges: Why do we have loops on our skin?

Look closer at your fingertips to see the microscopic mountain ranges that help you grab things.

FREE
Brain Zaps: How do thoughts travel through our head?
Neuroscience3 min

Brain Zaps: How do thoughts travel through our head?

See the microscopic electrical storms that happen every time you think of a purple elephant.

FREE
Sticky Secrets: How does a Gecko walk on the ceiling?
Materials Science4 min

Sticky Secrets: How does a Gecko walk on the ceiling?

Discover the millions of microscopic hairs that let lizards defy gravity.

FREE
The Shield: Why does our skin stay waterproof?
Dermatology4 min

The Shield: Why does our skin stay waterproof?

Explore the microscopic scales and oils that keep the outside world out and your insides in.

FREE
Fuzzy Monsters: Why does bread turn moldy?
Food Science5 min

Fuzzy Monsters: Why does bread turn moldy?

Watch the microscopic fungus 'forests' that grow on your sandwich if you leave it too long.

FREE
The Hijackers: Why are viruses different from bacteria?
Virology4 min

The Hijackers: Why are viruses different from bacteria?

Learn about the tiny 'robots' that try to take over your cells to make copies of themselves.

FREE
Plankton Power: Why are the tiniest sea creatures the most important?
Oceanography4 min

Plankton Power: Why are the tiniest sea creatures the most important?

Meet the microscopic drifters that feed the giants of the ocean.

FREE
Static Shocks: Why does the carpet zap my finger?
Physics4 min

Static Shocks: Why does the carpet zap my finger?

See the microscopic dance of electrons as they jump from the rug to your skin.

FREE
Magic Mold: How did a tiny fungus create Penicillin?
Medicine4 min

Magic Mold: How did a tiny fungus create Penicillin?

The true story of how a microscopic accident saved millions of lives.

FREE
The Gut Garden: Why do we have good bacteria?
Biology

The Gut Garden: Why do we have good bacteria?

Explore the three pounds of microscopic 'friends' living in your tummy right now.

FREE
The Glass Eye: How does a microscope see the invisible?
Optics4 min

The Glass Eye: How does a microscope see the invisible?

Learn how curved glass bends light to turn a speck of dust into a giant monster.

FREE