The Giant Dry Ice Bubble Sphere

If you’ve got some dry ice, why not gather friends and family and try your hand at making a large dry ice bubble? This is especially fun at Halloween, so we like to call it a “Ghost Bubble.” Who knows? Maybe you will see your future inside the Ghostly Sphere.

You will need

  • Medium size bowl with a rim
  • Small bowl
  • Liquid dish soap
  • 20 inch by 2 inch strip of absorbent cloth (cut up t-shirts work great)
  • Warm Water
  • Dry Ice – Available at some grocery stores and ice suppliers

CAUTION!: NEVER touch dry ice with your bare hands.
Always wear thick gloves and keep away from children.
NEVER place dry ice in a completely enclosed container.

What to do

  1. Fill each bowl halfway with water. In the small bowl, add a good squirt of liquid soap (we like Dawn Concentrate) and stir it up.
  2. Get the rim of the larger bowl wet with regular water using your fingers.
  3. Add the dry ice to the large bowl. Admire the sights and sounds of bubbling dry ice.
  4. Now the tricky part, dip the cloth into the soapy water to get it wet but not dripping wet. Pull the cloth strip so that it is taut and pass it across the entire rim of the medium bowl to create a soap bubble “skin” over the bowl. It may take several tries – don’t give up!

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Once you get it, the bubble will expand as gas is released and it will rise to create your own ghost bubble sphere. After the soap gets into the water with the dry ice, you are treated to soap bubbles filled with dry ice mist!

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Don’t worry about your bubble popping. We think that’s the coolest part!

Magnetic Breakfast Cereal!

Do You Eat Magnetic Cereal?

Look at the box your cereal comes in. If it says it has 100% of your daily recommended supply of iron, then this experiment will work for you, too. But you will also need a very powerful magnet. In this video I used as series of small neodymium magnets which are usually available in science supply catalogs. Our body uses iron to carry out cell production and made our blood. Iron is a mineral, and the iron found in your cereal used to be in the ground. Yum!

 

The Erupting Volcano

Make Your Own Erupting Volcano

This is a classic experiment and it is very easy to do at home. So after you watch it – TRY IT! All you need is some kind of model volcano, and then a little vinegar and some baking soda from the supermarket. Add color and dish soap and you’re ready to go! This demonstration shows an acid base reaction. In this kind of reaction, the acid (vinegar) chemically reacts with the base (the baking soda) and the two release carbon dioxide gas which bubbles out. The liquid soap helps make the “lava” foamy.

CLICK HERE FOR EXPERIMENT INSTRUCTIONS

 

How Cold is Cold?

So Cold It Boils?

Take a deep breath. The air you breathed in is mostly made of of a gas called nitrogen. When liquid nitrogen is made, it loses lots of its energy that it had when it was a gas. When it loses energy, its gets COLD – we’re talking -320 degrees fahrenheit cold. So why does it boil? Compared to the super-cold liquid nitrogen, the TV studio was really, really hot; hot enough for the nitrogen to boil. Liquid nitrogen would even boil in Antarctica!

As for the balloon…my breath was always in the balloon, but the carbon dioxide from my breath uses less space when it gets super cold, so the balloon shrank as the carbon dioxide inside the balloon compressed – cool huh?

Magic Part 3 – Memory Wire

This wire has a better memory than I do.

This is cool stuff. It’s called memory wire, or more specifically, nitinol wire. To perform this trick, I “programmed” the wire by bending it into the shape of the word “LIME.” Then I heated the wire using a butane flame. It took a while, but when I was all done, I could bend the wire into any shape and then just put it in hot water and I get the word “LIME” right back! Scientists are finding way to create motors using the heating and cooling properties of nitinol.

Magic Part 2 – Floating Paperclip!

Paper Clips Can’t Float.

It’s true, paperclips cannot float in water, but they can appear to float when suspended on the surface tension of water. Surface tension is like a “skin” on the surface of the water where water molecules bond together. With a steady hand, you can get a paperclip to suspend itself on the surface of the water. In this video, we also used a Japanese yen coin which is made of lightweight aluminum. How much weight can the surface tension of water hold? Don’t just sit there, go try for yourself and find out!

CLICK HERE FOR THE FLOATING PAPERCLIP INSTRUCTIONS

Magic Polymers?

Magic and Science Unite!

Sometimes magic and science work hand in hand as in this example of the vanishing water. This trick uses a super absorbent polymer. The polymer powder that was added to the cup acts like thousands of tiny sponges that expand when they get wet. The polymer can hold over 300 times its own weight in water. But the powder was not invented for magic tricks, it was invented for diapers! When super absorbent polymers are in use, no more leaky diapers.

Plasma Ball + Fluorescent Bulbs = Light!

Light Bulbs Glow Without Wires.

This video shows how regular fluorescent lightbulbs can glow when brought close to a plasma ball found in many novelty shops. The bulbs glow because the electricity in the plasma globe is sent from the center of the ball at high frequencies, similar to radio waves. The gas inside of fluorescent bulbs react the the high frequency electricity and they begin to glow!

Yay Static!

What does 500,000 volts look like?

Imagine if every hair on your head was trying to get away from every other hair on your head. You would look a lot like Lewis in this video. Static is a kind of charge created by tiny parts of atoms called electrons. Electron repel away from each other. When Lewis’ hair got charged, the electrons on each hair repelled away from the electrons on other hair and Lewis ended up looking awesome!

So how can 500,000 volts be safe? Why didn’t Lewis get fried? The static electricity created by this generator (and by your feet rubbing on the carpet) has very little power moving it. In fact, static means “not moving.” It also mean that the static electricity in not strong enough to get into your body. It stays on the outside of your body until you touch the ground, and then it safely travels into the earth. Static electricity can have enough voltage to be dangerous. Lightning is static electricity with 100,000,000 volts!

CLICK HERE FOR THE STATIC SODA CAN EXPERIMENT

Crazy Foam Experiment

Fun With Foam

Foam is fun! Check out this video to see our Fantastic Foamy Fountain in action. The experiment uses Hydrogen peroxide and dry yeast. Hydrogen peroxide is similar to water but it has an extra oxygen atom. This makes it more dangerous and only adults should handle the hydrogen peroxide.

When you add the yeast, it acts as a catalyst (a helper) to release the extra oxygen gas and the soap helps to create all the foam. Try it out yourself!

The second experiment with the giant foam eruption at the end used a more powerful hydrogen peroxide and a different chemical for a catalyst. The reaction happens very fast and gives off quite a bit of heat. It’s pure foam fun! I mean pure science.

What is the most poisonous animal in the world?

poison_frog“Poisonous animals” applies to animals that make you sick if you were to eat them. They may also use their poison as a defense against predators. Venomous animals generally use their venom to stun or kill other animals through a bite or sting. Despite what you may have heard, the “Daddy Long Legs” spider is NOT the most venomous animal at all. Some types are non-venomous and others have very little venom – and they are not even spiders!
So what is the most poisonous animal? That title goes to the poison arrow frogs of the rain forest. A drop of their venom the size of a pin head could kill a human. Just holding them is taking a risk on your life. Luckily, they have bright colors to alert you to their venomous status.

By the way, when it comes to VENOM, the Blue Ring Octopus is often considered the most venomous.

NOW YOU KNOW!

What are the steps to the Scientific Method?

The Scientific Method is an organized way of answering a science question. While different teachers and scientists have different versions of the Scientific Method, here are the typical six parts:

  1. Purpose- What do you want to learn?
  2. Research- Find out as much as you can.
  3. Hypothesis- Try to predict the answer to the problem. Another term for hypothesis is ‘educated guess’. This is usually stated like ” If I…(do something) then…(this will occur)
  4. Experiment- The fun part! Design a test or procedure to confirm or disprove your hypothesis.
  5. Analysis- Record what happened during the experiment. Also known as ‘data’.
  6. Conclusion- Review the data and check to see if your hypothesis was correct.

The scientific method is used all over the world every day to make new discoveries.

LEARN MORE ABOUT THE SCIENTIFIC METHOD BY CLICKING HERE

NOW YOU KNOW!

What is an owl pellet?

Owls are birds of prey. That means that they hunt the animals that they eat. After an owl eats the small rodents, birds, and bugs that are a part of its nightly diet, its stomach cannot digest the fur, bones, teeth, feathers, and insect shells from that food. These “extra” parts are formed into a tight PELLET inside the owl and are then are later SPIT UP by the owl. Pellets are usually about as big as an adult thumb and they are often dissected by students and scientist to help them learn exactly what owls eat and what kinds of small animals and bugs live in a particular area. If you get a chance to examine what is inside an owl pellet, you will be lucky, there is a lot to learn and it is surprisingly FUN!

NOW YOU KNOW!

Is a zebra white with black stripes or black with white stripes?

So, is a zebra white with black stripes or black with white stripes? Unfortunately, there is no true answer to this perplexing question. The reason is because the answer to this question comes down to a person’s perspective. Many zoologists would say that a zebra is white because its stripes end towards the belly and the belly is mostly white. Others would say that a zebra is black because if you shaved all the fur off a zebra the skin is, surprisingly,  mostly black. So the answer actually depends on who you ask and how you want to look at a zebra.

NOW YOU KNOW!

Why is the sky blue?

We have all wondered, at some point, why the sky is blue. Now is the time to find out – after all, someday your kids will probably ask YOU why the sky is blue! Ready?

The light that comes from the Sun is white. That white light is actually a mixture of all colors, but because they are mixed up we don’t see the separate colors just the white sunlight.

As the sun’s light passes through our atmosphere, the light becomes scattered by all the air and particles such smog and dust. The part of the sunlight that gets scattered the most is the blue part. That means that the blue gets separated from the other colors and we get a blue sky!

At sunset or sunrise, the sun is at a very low angle, so the rays pass through even more molecules and particles. This scatters the light even more, separating red, orange and yellow from the white light. The more particles, the more scattering.

NOW YOU KNOW!

What would a compass point to if you were at the North Pole?

Believe it or not, there are actually TWO North Poles – the one at the top of the earth and what is known as MAGNETIC NORTH. Magnetic north is actually in northern Canada, and that is where compasses point to.

Now, on to your question…if you were standing exactly on top of the magnetic north pole, your compass would point nowhere in particular since the place it is used to pointing to is at your feet! You should know that finding magnetic north is not always easy – the spot is actually moving about 10 miles northwest every year. Since it was discovered in 1831, magnetic north has traveled many miles from its original spot!

NOW YOU KNOW!

What is the difference between a moth and a butterfly?

A moth and a butterfly sure can look alike, and they both belong to the same insect family (Lepidoptera) but there are a few differences to look for so that you can tell them apart:

  • Butterflies usually rest with their wings closed, while moths rest with their wings open.
  • Butterflies have long, thin antenna, while moths have shorter feathery antennas.
  • Butterflies generally gather food during the day while moths are seen more at nighttime.
  • Most moths make a silky cocoon, while butterflies usually make a shiny chrysalis

By the way, did you know that the largest moth, the Atlas moth, can grow to be over 6 inches wide! That’s one big moth.

NOW YOU KNOW!

Is a tomato a fruit or a vegetable?

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To really figure out if a tomato is a fruit or vegetable, you need to know what makes a fruit a fruit, and a vegetable a vegetable. The big question to ask is, DOES IT HAVE SEEDS? If the answer is yes, then technically, (botanically) you have a FRUIT. This, of course, makes your tomato a fruit. It also makes cucumbers, squash, green beans and pumpkins all fruits as well. Along with the fruit from a plant or tree, we can often eat the leaves (lettuce,) stems (celery,) roots (carrots,) and flowers (broccoli.) Many of these other parts of the plant are typically referred to as VEGETABLES. Now don’t go looking for tomatoes next to the oranges in your grocery stores; fruits like tomatoes and green beans are usually (alas, incorrectly) referred to as “vegetables” in most grocery stores and cookbooks.

Did you know… A tomato is the official “vegetable” of New Jersey and  the official fruit (and vegetable) of Arkansas.

NOW YOU KNOW!

What is the largest insect in the world?

If you are creeped out by bugs, brace yourself.  Insects can get pretty big, but what is the largest insect in the world? “Largest” is a relative term. A mouse is large to a flea, but not to a giraffe. So there are several different ways of measuring the size of an insect, most people would consider the largest insect to be the bulkiest and in this case the champion insect is the Acteaeom Beetle or Rhinoceros Beetle (Megasoma actaeon) from South Americ. The male beetles can be 9cms long by 5cms wide by 4cms thick…that’s one bulky bug!

 Rhinoceros Beetle

If you want to measure largest by overall size, check out the South American Longhorn Beetle (Titanus giganteus) these giants can be over 16cms in body length (not including antennae)

titanusSouth American Longhorn Beetle

One other beetle, the Hercules Beetle, (Dynastes hercules) is also well known for reaching 16cms in length though it is not nearly as heavy.

herculesHercules Beetle

By the way, insects are larger in other ways, the longest insect in the world is the Stick-Insect (Pharnacia serritypes), the females of which can be over 36cm long.

NOW YOU KNOW!

Science Experiments, Experiment Videos, and Science Fair Ideas from Science Bob

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