Science Videos

 This Week's Video

Building a Rain Gauge, part 2
Key Concepts: rain

Be prepared to be surprised at how much rain falls on your yard.

Building a Rain Gauge
Key Concepts: rain

Be prepared to be surprised at how much rain falls on your yard.

A Model of the Water Cycle
Key Concepts: water cycle

Scientists use models to explore parts of science that are too large or complex to fit in the laboratory.

Science Friction
Key Concepts: friction

A challenging way to explore friction.

Calling a Woodpecker
Key Concepts: birds, behavior

An interesting technique for attracting a woodpecker.

How Heat Moves
Key Concepts: heat, conduction, convection, radiation

Explore the three ways that heat energy moves from one object to another.

Bendable Bones
Key Concepts: skeleton, chemistry of bones

A classic exploration of the chemistry of bones.

Reading a Skeleton
Key Concepts: skeleton forensics

Learn a little forensic osteology to help you bone up on bones.

Science and the Haunted Pumpkin
Key Concepts: indicators acid base

Use a little chemistry to spice up a Halloween ghost story.

Igneous Sugar
Key Concepts: intrusive extrusive igneous rocks

A fun, easy, tasty way to explore the difference between magma and lava.

Scavengers and Decomposers
Key Concepts: food web, energy, living systems

Meet the "clean-up crew" of the food web.

Sunglass Science: Birefringence
Key Concepts: light

This time we will explore things that are usually invisible, revealing new things about the world around us.

Sunglass Science: Polarized Light
Key Concepts: light

Grab your shades for a different way of seeing the world around you.

Bird Bones
Key Concepts: skeleton, muscles

A simple, easy dissection to compare a bird's skeleton with our own.

Food Chain: Secondary Consumers
Key Concepts: food chain, energy, predators

Take the next step up the food chain to look at predators.

Water in a Glass, part 3
Key Concepts: forces, motion, air pressure, gravity, surface tension

The answer to the challenge from part 2, and a fun, science trick.

Water in a Glass, part 2
Key Concepts: forces, motion, air pressure, gravity

The answer to last week's video, and another challenge.

Water in a Glass, part 1
Key Concepts: forces, motion, air pressure, gravity

What really causes the water to stay in this upside down glass?


Lighting a Bulb with a Balloon
Key Concepts: static electricity

Can you really light a lightbulb with a balloon?


156. Science of Credit Cards
Key Concepts: magnetism, charges

Why does putting a plastic bag over a credit card make it scan better?


Key Concepts: faults, earthquakes

What is a fault? How do they form? What can they tell us?.


Primary Consumers
Key Concepts: food chain, producers, consumers

Take the next step up the food chain.


153. What is Science?
Key Concepts: the process of science

Defining science is not as easy as it might seem.


152. Laser Projection Microscope
Key Concepts: microscope, protists

An incredibly easy way to build a projecting microscope.


151. Food Chain: Producers
Key Concepts: food chain, producers, plants, energy

Explore the base of the food chain.


150. The Compass and Magnetic Fields
Key Concepts: magnets, magnetic poles

Use the compass that you constructed in the last video to explore magnetic fields.


149. Make a Compass
Key Concepts: magnets, magnetic poles

Construct a compass that can help you find north, and much more.


148. A Walk in the Park
Key Concepts: urban wildlife, nature watching techniques

Just because you live in the city does not mean you can't see amazing wild life.

Nature watching science video

147. Floating Cups
Key Concepts: methods of science, air pressure

Help figure out what is really happening in this experiment.


146. The 25,000 volt Leyden Jar
Key Concepts: electrostatics, charges, circuits


145. The Science of Flutes
Key Concepts: sound, pitch, mass, energy

How do musical instruments produce different tones?


144. Observation
Key Concepts: observation, perception


143. Mirage
Key Concepts: refraction, density

Do you have to be in the desert to see a mirage?


142. Global Science
Key Concepts: Earth, Moon, seasons, Sun

How much science can you learn with a globe?


141. Strange Flame, part 2
Key Concepts: inertia

How can a glass vase reverse the movement of a flame?


140. Strange Flame, part 1
Key Concepts: inertia

How can a glass vase reverse the movement of a flame?


139. Radioactive
Key Concepts: atoms, radiation

What does the word "radioactive" really mean?


138. The Cloud Chamber
Key Concepts: atoms, radiation

Construct a simple device to let you detect atomic particles.


137. The Fire Diamond
Key Concepts: combustion, energy

What basic things do you need for a fire?


136. Illusions
Key Concepts: optical illusions

Learn some of the science of tricking your brain.


135. Mobius Space
Key Concepts: shapes and surfaces

Can an empty space have only one side?


134. Magic Coin
Key Concepts: inertia, motion

Use science to make a coin seem to magically rise from a matchbox.


133. A Color You Can't See
Key Concepts: light, spectrum

Use your cell phone to see a color you can't see


132. Balloon on a Stick
Key Concepts: polymers

Learn the science behind this classic demonstrationl


131. Dry Ice
Key Concepts: states of matter, sublimation

Learn some tricks with dry ice as you explore the science of sublimation.


130. A Watched Pot
Key Concepts: states of matter, solutions

Who would think that there could be so much science in a pot of boiling water?


129. A Boat Full of Holes
Key Concepts: surface tension

A hole in a boat can cause it to sink, so what if you have a boat made entirely of holes?


128. The Koffka Ring Illusion
Key Concepts: illusion, perception

Trick your brain into seeing two different shades of grey, even though you KNOW they are both the same.


127. Making Craters
Key Concepts: models, inertia, observation

Try making your own craters, and then compare them with photos of the real thing.


126. Changing the Speed of Light
Key Concepts: light, refraction

Altering the speed of light to see around a corner.


125. Blowing Out a Candle
Key Concepts: combustion, scientific method

It is amazing how much science is involved in the simple act of blowing out a candle.


124. Floating Bubbles

Key Concepts: gases, density

A fun way to explore density.


123. The Bernoulli Effect
Key Concepts: air pressure, fluids

A simple challenge to let you explore pressure and moving air.


122. Cabbage Indicator
Key Concepts: chemical changes, indicators

A classic chemistry demo that is fun and easy to do.


121. Changing Colors, Part 2
Key Concepts: chemical changes, indicators

Mix two clear liquids to produce a white liquid. Then mix it with the black liquid from part 1, to get another clear liquid.


120. Changing Colors, Part 1
Key Concepts: chemical changes, indicators

Mix two clear liquids to produce a black liquid.


119. Fireworks Colors
Key Concepts: combustion, indicators

How do they get the colors in fireworks?


118. Hunting with an Umbrella
Key Concepts: habitats

What sort of strange creatures would you hunt with an umbrella?


117. Curves Illusion
Key Concepts: optical illusion

Which curved piece of paper is really longer?


116. Sorting Salt and Pepper
Key Concepts: electrostatic charges

Can you mix salt and pepper and then separate them again? Of course you can!


115. Egg States
Key Concepts: states of matter

How can a liquid mixed with a gas seem like a solid?

egg states

114. Spoon on Your Nose
Key Concepts: adhesion

How can you hang a spoon on your nose?


113. Spoon Bells
Key Concepts: sound, conduction

Using spoons and string to hear sound in a different way.


112. The Pool, the Boat, and the Anchor, part 2
Key Concepts: density, floating and sinking

The answer to the fun science puzzle.


111. The Pool, the Boat, and the Anchor
Key Concepts: density, floating and sinking

A fun science puzzle.


110. Feathers
Key Concepts: birds, feathers

The most complex skin covering of any vertebrate.


109. Two Coins
Key Concepts: human body, sight, brain

Instant science: An illusion to make two coins look like three.


108. Bird on a Wire
Key Concepts: circuit, electricity

How can birds sit on power lines without getting shocked?


107. Osmosis
Key Concepts: cells,

Explore a chemical process that keeps your cells going.


106. Just a Suggestion

Key Concepts: human body, brain

Can you resist scratching your nose?


105. Simple Circuit
Key Concepts: electricity, circuit, conductor, insulator

Construct a simple circuit and use it to test conductors and insulators.


104. Introduction to Light Emitting Diodes

Key Concepts: electricity, diode, resistor, circuit

Using LEDs as a way to get started learning about electricity.


103. The Versorium
Key Concepts: electricity, static, charges

Construct a simple device for detecting static charges.


102. Solar Power

Key Concepts: light, refraction, reflection, energy

A look at one of the world's largest solar power plants.


101. White Foam
Key Concepts: light, color, clouds

If bubbles are clear, then why are soap suds white?


100. Wax and Wood, part 2
Key Concepts: chemistry, polar and nonpolar

The answer to the challenge. Did you get it right?


99. Wax and Wood, part 1
Key Concepts: chemistry, polar and nonpolar

We start by putting wood and wax into water, and watching them separate. The challenge is to get them to change places.


98. The Stroop Effect
Key Concepts: Human body, brain

How good is your brain at working with two bits of information at the same time?


97. Wonderful Water
Key Concepts: Chemistry, states of matter, density

Because it is so common, we forget how chemically bizarre water is.


96. Iron Cereal
Key Concepts: Chemistry, compounds, mixtures, magnetism

What do they put into breakfast cereal to give you your daily requirement of iron?

Iron Cereal

95. Kneesy, Earsy, Nosey
Key Concepts: Human body

How good are you at moving across the midline?


94. Cola Color
Key Concepts: chemistry

Why do cola drinks contain caramel color?

Cola Color

93. The Bullroarer
Key Concepts: sound, vibration

Make this simple, science toy to learn about sound, while making sounds to annoy,..I mean amuse
 your family.

The Bullroarer

92. Taking a Marshmallow Apart
Key Concepts: chemistry

Take a marshmallow apart to see what it is made up of.

Taking a Marshmallow Apart

91. Stable Image
Key Concepts: human body, sight

Learn some of how your brain stabilizes images.

Stable Image

90. Stale Bread
Key Concepts: chemistry

Why does bread go stale so much faster than cake?

Stale Bread

89. Static Charges
Key Concepts: electricity

An introduction to induction.

Static Charges

88. Scaring Pepper
Key Concepts: surface tension

Learn about surface tension on water while playing a fun trick on your friends.

Scaring Pepper

87. Why Wet Things Won't Burn
Key Concepts: combustion

What is it about water that keeps things from burning?

Why Wet Things Won't Burn

86. The Hottest Part of the Flame?
Key Concepts: energy, scientific observation

What is the hottest part of a flame? It may not be where you think it is.


85. Science Fair Panic, part 4
Key Concepts: science fair help

What if things go WRONG?!?!.

Science Fair Panic, part 4

84. Science Fair Panic, part 3
Key Concepts: science fair help

This time we talk about controlling variables.

Science Fair Panic, part 3

83. Science Fair Panic, part 2
Key Concepts: science fair help

This time we talk about research and forming a hypothesis.

Science Fair Panic, part 2

82. Science Fair Panic, part 1
Key Concepts: science fair help

Its time to start thinking about your Science Fair Project, but don't panic. Take a minute and set some goals.

Science Fair Panic, part 1

81. Hydrothermal Quartz
Key Concepts: solutions, boiling point

How can hot water form such beautiful quartz crystals? It takes a lot of pressure!


80. Chromatography
Key Concepts: chemistry

Can you tell which pen was used to write a message? Of course you can, if you know the science of chromatography.


79. White Balance
Key Concepts: light, vision

Have you ever taken a photo that turned out very yellow or with a blue tint? Now you will know why..

White Balance

78. Testing for Tannic Acid
Key Concepts: chemistry, plants

A fun but smelly test to find tannins in your food.

Testing for Tannic Acid

77. More Science of Balance
Key Concepts: motion, inertia

Make this fun, science toy, and learn more about how things balance.

More Science of Balance

76. Raw Egg or Boiled?
Key Concepts: motion, inertia

Can you tell the difference between a raw egg and a boiled egg, without breaking the shell? Of course you can, if you know the science.

Raw Egg or Boiled?

75. The Science of Balance
Key Concepts: gravity, balance

Understanding center of gravity and base can make it easier to balance.

Science of Balance

74. Light Speed Chocolate
Key Concepts: energy

Use chocolate and your microwave oven to measure the speed of light.

Light Speed Chocolate

73. Microwave Chocolate
Key Concepts: matter

Combine science and chocolate to learn how a microwave oven works.

Microwave Chocolate

72. Air Space
Key Concepts: matter

How many cotton balls can you fit into a full glass of water?.

The Waterfall Effect

71. The Waterfall Effect
Key Concepts: Optical Illusion

Try this natural, optical illusion, which tricks your eyes and brain with motion instead of color.

The Waterfall Effect

70. Ice Cream Science
Key Concepts: Energy, Heat, States of Matter

Even in the desert, you can make a cold, tasty snack with some common items and a little science.

Ice Cream Science

69. Relative Motion
Key Concepts: Motion

How fast are you moving right now? Probably faster than you think!

Relative Motion

68. Oxygen? No!
Key Concepts: Chemistry, Light

Try this classic science experiment, and see why it does not show what many people think it does.

Oxygen? No!

67. Silver Pictures
Key Concepts: Chemistry, Light

Have you ever wondered how photographs work? With this simple experiment, we will find out.

Silver Pictures

66. Disappearing Water
Key Concepts: Chemistry

Like magic tricks? Here is a fun one where the science does the work.

Disappearing Water

65. Looking for Rainbows
Key Concepts: Light

Learn the science of rainbows, and you will know exactly where to look to see them.

64. Heartless Plants
Key Concepts: Plants

Without a heart to pump the fluids, how can plants get water from their roots all the way up to their leaves?

63. Making Butter

Key Concepts: Chemistry

What can you do with a jar of spoiled cream? Make Butter!

62. Is That a Color Photo?
Key Concepts: Vision, Light

Trick your eyes and brain into seeing color in a black and white photo.

61. Milk Bubbles
Key Concepts: Surface Tension

Learn about surface tension while blowing bubbles in your milk.

60. Extra Oxygen
Key Concepts: Chemistry, Air, Combustion

Try this experiment to see what adding extra oxygen to a fire can do.

59. Nature Watching
Key Concepts: Process of Science, Animal Behavior

Practice your observational skills while watching wildlife.

58. Density Column
Key Concepts: Density

This experiment is one of the classics that is still a lot of fun to play with. It has to do with density.

57. Why Things Go Bang
Key Concepts: Sound

Why do fireworks make so much noise?

56. Ice and String
Key Concepts: States of Matter, Energy, Change of State

Can you lift an ice cube out of a bowl of water with a piece of string? Of course you can, if you know a little science, and have a little salt.

55. Light as Air

Key Concepts: Air, Density

Have you ever heard someone say that something was "as light as air"? Exactly how light is air? Probably a lot heavier than you think. Try this fun, easy way to calculate the weight of the air in your room.

54. Measuring Lightning
Key Concepts: Lightning, Sound

Many people know that you can use thunder to tell how far away the lightning is, but they often get confused as to how to do it.

53. Selective Smelling
Key Concepts: Human Body, Senses

You've seen optical illusions, but have you ever tried a "nose illusion"?

52. Noisy String
Key Concepts: Sound, Vibration

This fun activity will let you learn about sound while making all sorts of strange sounds.

51. Hanging a Hammer
Key Concepts: Balance, Gravity, Levers, Simple Machines

Can you balance a hammer, a ruler and some string on the edge of a table? Of course you can!

50. Planets and Pennies
Key Concepts: Planets, Gravity

Try this simple experiment to see how the pull of gravity varies on the planets in our Solar System.

49. Measuring in Feet
Key Concepts: Human Body, Forensics

Did you know that your foot is the same size as your head?

48. Bottle Tones, Part 2
Key Concepts: Sound, Vibration

The answer to the previous video. Did you get it right?

47. Bottle Tones
Key Concepts: Sound, Pitch

Find out why changing the water level in a bottle changes the sounds that it can make.

46. About Microwaves
Key Concepts: Energy, Electromagnetic Waves, Molecules

Why wet food cooks better than dry food in a microwave oven.

45. Flame Color
Key Concepts: Combustion

Have you ever wondered why some flames are yellow, while others are blue?

44. Candles in a Jar, Part 2
Key Concepts: Combustion, Carbon Dioxide, Density, Scientific Thought

Finally, the solution to video #43!

43. Candles in a Jar
Key Concepts: Combustion, Carbon Dioxide, Density, Scientific Thought

If you place a tall candle and a short candle under a glass jar, which will run out of oxygen first?

42. Ice and Soda
Key Concepts: Gases

How can you pour a glass of soda without getting a glass that is half soda and half foam?

41. Foot Circles
Key Concepts: Human Body

Try this strange trick to see how your brain communicates with your body.

40. Reaction Time
Key Concepts: Human Body, Science Fair Projects

Test your reaction time.

39. Wrong Way Balloon
Key Concepts: Inertia

Why does a helium balloon act strange in a car?

38. Doppler Effect
Key Concepts:

Why does the sound of a car change as it passes you?

37. Emergency Glasses
Key Concepts: Light, Lenses

Learn how to make quick, easy, emergency eyeglasses.

36. Hear the Ocean?
Key Concepts: Sound

Can you really hear the ocean in a seashell?

35. The Science of Pizza
Key Concepts: Heat

You can even learn about science when you're eating pizza.

34. Grass Whistle
Key Concepts: Sound

Learn how to make all sorts of unusual sounds with a blade of grass.

33. The Right Answer
Key Concepts: Processes of Science

How many ways can you think of to keep water in a glass when it is turned upside down.

32. Half a Water Balloon
Key Concepts: Properties of Liquids and Gases

Have fun and make a mess while learning about science with half a water balloon.

31. The Singing Glass
Key Concepts: Sound, Vibration, Friction

Play music with a glass of water.

30. When Sugar Isn't Sweet
Key Concepts: Molecules, Taste

How can you put sugar on your tongue and not taste anything sweet?

29. Why We Sweat
Key Concepts: Energy, States of Matter, Evaporation

Why does heat and hard work make you perspire?

28. Obedient Coin
Key Concepts: Inertia

Try this fun challenge next time you are waiting in a restaurant.

27. Got the Red Green Blues
Key Concepts: Light, Color

Use a drop of water to see the true colors on your television.

26. Preview of Electricity DVD

Well, the team is swamped, finishing our new Electricity DVD, so I thought I would give you a sneak preview of what we are working on.

25. Paleo Cookies
Key Concepts: Paleontology

Learn about being a paleontologist and eat cookies at the same time.

24. Pick a String
Key Concepts: Inertia, Newton's Laws

Use inertia to challenge your friends and win every time.

23. How They Get the Sparks in a Sparkler
Key Concepts: Chemistry, Combustion

Find out how burning metal produces the sparks in fireworks.

22. Is That a Diamond?
Key Concepts: Minerals

Is it true that you can identify a diamond by cutting glass? 

21. Smoke Rings
Key Concepts: Friction, Motion

Produce beautiful smoke rings from a soda bottle. 

20. Orange Flash
Key Concepts:
Plants, Combustion

Can you make flames shoot out of an orange? Of course you can! 

19. Strengthening the Dollar
Key Concepts: Shape and Structure

This week we will are going to build a bridge.  

18. Coins Through a Hole
Key Concepts: Surfaces and Spaces

Use the science of topology in a challenge that will frustrate your friends.  

17. Making Water Wiggle
Key Concepts: Electricity, Static Charges

Use a balloon to attract a stream of waterr.  

16. Making Turmeric Paper
Key Concepts: Chemistry, Indicators

Use a common spice to make a pH indicator.  

15. Fingerprints
Key Concepts: Crime Science

Make your own fingerprint dust, and collect your fingerprints from a glass.  

14. Tricky Bottle
Key Concepts: Air Pressure

Use air pressure to control the flow of water.  

13. Color Changing Flowers
Key Concepts: Chemistry, Indicators

Use the science of chemistry to change the color of flowers. 

12. Seed Search
Key Concepts: Botany

Explore some of the ways that plants spread their seeds.

11. Going Through a Card

Key Concepts: Surfaces and Spaces

Start with a standard 3X5 index card, and cut a hole in it that is large enough to fit your body through.

10. Why Wet Things Turn Dark
Key Concepts: Light

Why does adding clear water to white paper make it look darker?  

9. Finding Your Way
Key Concepts: Astronomy

If you were lost in the woods, would you be able to determine which way was north?

8. Cartesian Diver
Key Concepts: States of Matter, Density

This classic experiment is a fun way to explore why things float or sink.  

7. Relighting Candles
Key Concepts: Chemistry

Try this dramatic experiment to add some science fun to your next birthday party.  

6. Möbius Strip
Key Concepts: Surfaces and Spaces

Use the science of Topology to make an object with only one side and only one edge.  

5. Crushed Can
Key Concepts: Air Pressure

Use steam and air pressure to crush a can in a fraction of a second.  

4. Orange Slices
Key Concepts: Plants

Use science to tell the number of sections in an orange before you slice it.  

3. Heating a Balloon
Key Concepts: Heat Energy

Can you hold a balloon in a candle flame without popping it? You can if you know the science!  

2. High Bounce
Key Concepts: Forms of Energy

Transfer energy to get a tennis ball to bounce higher than a house. Be sure to do this high energy experiment outside!  

1. The Old Tablecloth Trick

Key Concepts: Inertia

Learn about the science of inertia with a classic experiment that will amaze your friends.