Season 2

Video thumbnail: Be Smart Why Do We Laugh?

Be Smart

Why Do We Laugh?

Several jokes were harmed in the making of this video

Why Do We Laugh?

Video thumbnail: Be Smart Why Are Cicadas So Good At Math?

Be Smart

Why Are Cicadas So Good At Math?

Do periodical cicadas "know" how to calculate prime numbers?

Why Are Cicadas So Good At Math?

Video thumbnail: Be Smart Your Salad Is Trying To Kill You

Be Smart

Your Salad Is Trying To Kill You

The dose makes the poison…

Your Salad Is Trying To Kill You

Video thumbnail: Be Smart How Does A Canyon Become Grand?

Be Smart

How Does A Canyon Become Grand?

And a very Grand Canyon it is…

How Does A Canyon Become Grand?

Video thumbnail: Be Smart Why Are The Bees Dying?

Be Smart

Why Are The Bees Dying?

If bees go, will they take us with them?

Why Are The Bees Dying?

Video thumbnail: Be Smart Which Came First - Flowers or Bees?

Be Smart

Which Came First - Flowers or Bees?

Stop and smell the flowers… and watch this video

Which Came First - Flowers or Bees?

Video thumbnail: Be Smart The Surprising Places We Waste Energy

Be Smart

The Surprising Places We Waste Energy

We use a LOT of energy, but we waste a lot too.

The Surprising Places We Waste Energy

Video thumbnail: Be Smart Does The Moon Really Orbit The Earth?

Be Smart

Does The Moon Really Orbit The Earth?

What holds the moon up? Moonbeams!

Does The Moon Really Orbit The Earth?

Video thumbnail: Be Smart What's The Loudest Possible Sound?

Be Smart

What's The Loudest Possible Sound?

It's definitely higher than "11"

What's The Loudest Possible Sound?

Video thumbnail: Be Smart Could We Clone Ourselves?

Be Smart

Could We Clone Ourselves?

Just be yourself! Or be your other self. Whichever.

Could We Clone Ourselves?

Video thumbnail: Be Smart Is Ultron Inevitable?

Be Smart

Is Ultron Inevitable?

Will artificial intelligence ever surpass human intelligence?

Is Ultron Inevitable?

Video thumbnail: Be Smart What Color is the Universe?

Be Smart

What Color is the Universe?

Hint: It's not black

What Color is the Universe?

Video thumbnail: Be Smart Your #ScienceWoman Heroes

Be Smart

Your #ScienceWoman Heroes

We teamed up with Amy Poehler's Smart Girls to ask you who your #sciencewoman heroes are.

Your #ScienceWoman Heroes

Video thumbnail: Be Smart How Many Heartbeats Do We Get?

Be Smart

How Many Heartbeats Do We Get?

Science really gets my heart going…

How Many Heartbeats Do We Get?

Video thumbnail: Be Smart 5 Weird Involuntary Behaviors Explained!

Be Smart

5 Weird Involuntary Behaviors Explained!

Yawns, hiccups, twitchy eyes (and more) explained!

5 Weird Involuntary Behaviors Explained!

Video thumbnail: Be Smart Why People Don't Believe In Climate Science

Be Smart

Why People Don't Believe In Climate Science

Scientists overwhelmingly agree that our climate is changing.

Why People Don't Believe In Climate Science

Video thumbnail: Be Smart Building Curiosity

Be Smart

Building Curiosity

An ode to curiosity… with LEGO

Building Curiosity

Video thumbnail: Be Smart The Sixth Extinction

Be Smart

The Sixth Extinction

This time, we're the asteroid

The Sixth Extinction

Video thumbnail: Be Smart Why Are Some People Left-Handed?

Be Smart

Why Are Some People Left-Handed?

The science of their sinister ways…

Why Are Some People Left-Handed?

Video thumbnail: Be Smart Why I'm Scared of Spiders

Be Smart

Why I'm Scared of Spiders

The science of… OH GOD IS THAT A SPIDER?!

Why I'm Scared of Spiders

Video thumbnail: Be Smart Why Does The Earth Have Layers?

Be Smart

Why Does The Earth Have Layers?

…or why we live on an onion made of magma

Why Does The Earth Have Layers?

Video thumbnail: Be Smart Why Do Clouds Stay Up?

Be Smart

Why Do Clouds Stay Up?

There's nothing wrong with having your head in the clouds

Why Do Clouds Stay Up?

Video thumbnail: Be Smart A Slice of Pizza Science!

Be Smart

A Slice of Pizza Science!

How does math keep a folded slice from drooping?

A Slice of Pizza Science!

Video thumbnail: Be Smart The Physics of Space Battles

Be Smart

The Physics of Space Battles

How scientifically accurate is your favorite sci-fi space battle?

The Physics of Space Battles

Support for PBS.org provided by: