Category: Experiments

Hopping Ahead of Climate Change

3/14/2023

Sneed B. Collard III

Connecting Scientists and Kids

Earth’s temperatures are getting warmer. In fact, sixteen of the seventeen hottest years on record have occurred since the year 2000. These warmer temperatures are driving larger, long-term changes in our planet’s weather and climate. Scientists refer to these changes as “climate change.”

In a few places, climate change might be welcome, but around the world, warmer temperatures and other changes are leading to a host of problems from rising sea levels to more extreme weather events and the spread of harmful human diseases.

Professor Scott Mills, from the University of Montana, wanted to see how climate change might be affecting one particular animal called the snowshoe hare.

Snowshoe hares live in regions of North America that receive snow every winter. The hares, in fact, change their coat color from brown to white and back again every year. This helps camouflage them against their background—and hides them from the eyes of lynx, owls, and other hungry predators.

  Here’s the thing: snowshoe hares can’t choose when they molt, or change their coat color. Molt timing is controlled by their genes, which are part of the DNA inside their bodies. If a hare’s genes make it molt to white in October, but snow doesn’t fall until December, the hare will stick out like a light bulb against the brown earth. And that’s a problem. Why? Because almost everywhere on earth, the length of time with snow on the ground is growing shorter and shorter.

  To find out if shorter winters might harm hare populations, Scott and his team spent three years tagging and following hares. They measured how many were born, how many died, and what they died from. They also recorded whether the hares were matched or mismatched against their backgrounds.

  They discovered that predators killed mismatched hares significantly more often than hares whose coats match their backgrounds. Scott and his team also calculated that over the next one hundred years, this greater mortality, or death rate, could lead to the decline or disappearance of many snowshoe hare populations.

  The good news? Different hares molt at different times. This may help some hare populations adapt to shorter winters and longer periods without snow.

  Hares are not the only animals affected by shorter winters. More than twenty species of animals including lemmings, weasels, hamsters, and Arctic foxes change their coat colors every year. Scott’s research helps us predict what might happen to these animals—and decide what we can do to protect them.

Scott’s discoveries about Montana snowshoe hares, together with experts’ predictions about our future climate, indicate that hares will be mismatched between 5-½ and 10 weeks by the end of this century.

Before tagging and putting a radio collar on a snowshoe hare, Professor Mills and his team must weigh and measure it.

This snowshoe hare has been tagged and fitted with a radio collar—and is now ready to help scientists learn more about snowshoe hare survival.

Even from a great distance, a mismatched hare stands out like a glowing light bulb. (Photo Courtesy of L. Scott Mills research laboratory)

Besides serving as popular prey for predators, snowshoe hares are irresistibly cute. This is a young hare, also called a leveret.

Sneed B. Collard III is the author of more than eighty award-winning books, many focusing on science and the natural world. His entertaining memoir Snakes, Alligators, and Broken Hearts—Journeys of a Biologist’s Son recounts his challenges and adventures growing up as the son of divorced biologist parents, and the experiences that would one day lay the foundation for his writing career. He is a dynamic speaker and offers school and conference programs that combine science, nature, and literacy. To learn more about him and his talks, visit his website, www.sneedbcollardiii.com.
This book was reviewed by Vicki Cobb in the Huffington Post: "The Cheeseburger of the Forest".

MLA 8 Citation
Collard, Sneed B., III. "Hopping Ahead of Climate Change." Nonfiction Minute, iNK Think Tank, 15 Nov. 2017, www.nonfictionminute.org/hopping-ahead-of-climate-change.

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What Can You Learn from a Holiday Light and a Glass Cup?

2/9/2023

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Vicki Cobb
The Master Chef of Kids’ Hands-on science

A land surveyor sends a heliograph to his partner more than 100 years ago. He must have been fluent in Morse Code

How do you know it’s the holiday season? There are lights everywhere sending that message. But that’s not the only kind of message light can send. A little more than 100 years ago when a telegraph began to become popular, people sent wireless messages called heliographs. They were made of flashes of light in Morse code (the same pattern of short and long as used in telegraphs) by reflecting the sun’s rays with a mirror. When the mirror was at a particular angle to the sun, it reflected a flash of bright light to observer miles away.

Note where the red light from the bulb emerges on the opposite side. Some internally reflected light is emerging from a ridge in the glass. Photo by Alexandra Siy

Maybe there’s another way to send light. Put a holiday light on one rim of a heavy glass measuring cup or dish. See where the light emerges on the rim on the opposite side. Move the light back and forth and watch what happens on the other side. The light travels down the side, and bends to go across the bottom and up the other side, but if you look at the cup sideways you can’t see the beam. Light stays inside the glass as it travels from rim to rim.

Could we make something like a wire from glass that can transmit light? Absolutely! An optical fiber is a flexible, transparent fiber made of glass or plastic that acts as a wire for light. Imagine a beam of light entering a fiber at exactly the right angle to bounce off the inside wall of the fiber where it meets the air. It is then reflected at exactly the same angle to bounce off the opposite wall making a zig-zag path until it reaches the end of the fiber. This internally reflected light stays inside the glass fiber as it travels at the speed of light.

HUGE quantities of all kinds of information—words, pictures, music, and videos—can now be sent through optical fibers, much more than through wires. A modern network with copper wiring can handle about 3,000 telephone calls at the same time, while a similar system using fiber optics can carry more than 30,000!

So when you hit “send,” know that your holiday message is a blinking beam of light, bouncing off the inside walls of a glass fiber on its speedy journey to friends and family. How ‘bout that!

Fiber optics can be made into holiday decorations. Note the bright light emerging from the ends of the fibers.

Want to know more about optics? Have a look at Vicki Cobb's book Light Action! She co-authored it with her son, Josh, who is an optical engineer and her other son, Theo, drew the pictures. It's full of experiments that let you use optics to:
-Bend light around corners
- Stop time with a pair of sunglasses
- Capture light on a silver tray
- Magnify pictures with an ice cube
- Pour light into your palm
- Project a big-screen image from your small TV
- Fool a doorbell with a bike reflector!
For more information, go here.

Vicki is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Cobb, Vicki. "What Can You Learn from a Holiday Light and a Glass Cup?" Nonfiction Minute, iNK Think Tank, 14 Dec. 2017, www.nonfictionminute.org/ What-Can-You-Learn-from-a-Holiday-Light-and-a-Glass-Cup.

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The Mystery of the Alternating Nostrils

11/14/2022

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Vicki Cobb
The Master Chef of Kids' Hands-On Science

Are your two nostrils exactly the same size? Don’t struggle to find out by looking in a small mirror. Put your nose right above the mirror and breathe down on it. You will see two circles of moisture as the warm moist air from your nose condenses into water when it hits the cool mirror surface. One circle will be a LOT larger than the other.

    You might conclude that yes, one nostril is bigger than the other; that you will have to live with being lopsided. But wait! I mean wait an hour or so and do it again. Surprise! This time the small nostril is now the BIG one! The larger nostril is dominant and takes in more of the air. You can do scientific study of your nose and see just how long each nostril dominates. Perhaps if you check often enough, you’ll discover a time when the two circles will be about the same size. This will be the moment of the changing of the nostrils. Of course, you have to do this study when you don’t have a stuffy nose.

    What’s behind this? It seems that your nostrils are on an automatic timer from your brain so that they take turns being dominant. It’s very interesting. But I’m not sure if it is important.

    Not many people know about this. But your dentist might. A dentist is always looking at peoples’ nostrils. See if your dentist knows about this. He or she might even know why this happens. This just might be a medical mystery worth investigating. And you might be just the one to do it.

Vicki Cobb ‘s “Discover Your Senses” series of books are available through the iTunes store. She begins by asking: “Know how to stop smelling? Hold your nose.” Also, check your library for copies. I mean wait an hour or so and do it again.

Vicki is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Cobb, Vicki. "The Mystery of the Alternating Nostrils." Nonfiction Minute, iNK Think Tank, 21 Nov. 2017, www.nonfictionminute.org/the-mystery-of-the-alternating-nostrils.

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Flat Paper Flight

5/26/2022

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Jan Adkins
The Explainer General

Since he was a boy, John Collins has been fascinated by paper airplanes. Who isn’t? Most of us have folded the familiar dart-shaped classroom airplane. Good fun. And it’s science.

Big and small aircraft depend on the same four principles: weight (of the craft), drag (wind resistance over the craft), lift (upward force from air passing over the craft’s flight surfaces), and thrust (what pushes the craft). A 747 Jumbo Jet and a paper airplane depend on the same forces.

     Collins wanted to fold this aeroscience into paper. But how to build (fold) complex principles into something so small?

     He found the ancient Japanese art of origami and used its sculptural tricks. He created paper aircraft that do astonishing things. One comes back in a horizontal circle, like a boomerang. Another flies up, turns over and comes back vertically. One actually flaps its wings as it glides slowly. To John, they’re all working science experiments: every flight leads to some knowledge and to new ideas for tweaking the aircraft so it flies better.

     John Collins became “The Paper Airplane Guy.”  He believes that scientific research happens everywhere, every day. He says, “It doesn’t take computers, lab coats, microscopes and the like. It takes a hunger to know. Science is just the structured way we find stuff out. The science you can do with a simple sheet of paper is no less important than what can be done with an electron microscope.”

     On February 26, 2012, John and Joe Ayoob stood in a big, windless aircraft hangar with John’s best-so-far flyer, Suzanne. (He named it after his wife.) Joe was a professional football quarterback who learned to throw Suzanne hard but steady, not like a football but like a delicate piece of origami. Joe threw Suzanne up, up, and it dived down to fly – really fly – 226 feet and 10 inches, the Guinness World Record for distance thrown.

     John wanted paper airplanes to welcome young people into science. He started a National Paper Airplane Contest called the Kickstarter Project with a big prize for anyone who throws Suzanne farther than Joe. Or you could throw your own better, more aeronautically elegant paper airplane. It was a simple, scientific task. Every paper airplane and every flight would be a new experiment, just as important as the Wright Brothers’ Kittyhawk flight. Science isn’t just geeks and labs; we’re all part of it. The project didn’t get support and ended. John would like to direct people to  www.TheNationalPaperAirplaneContest.com. Air and Science museums across the country will be hosting events. The museums get three Fly for Fun Days; STEM education days that teach basic flight concepts and skills for the national contest.

Some of John's amazing folded planes

If you would like to build your own championship plane Suzanne, begin here with the step of step instructions.

John Collins with one of his planes whizzing past him.

STEP2-Diagonal fold

STEP 3-Unfolded

STEP 5 – Unfolded

STEP 4- Diagonal the other way.

STEP 6 - Fold side to the diagonal

STEP 7 - Fold other side to the diagonal

STEP 8 - Fold across center of diagonal

STEP 9 - Fold the crease

STEP 11 - Fold in half

STEP 13 - One wing done

STEP 10 - Fold the other crease

STEP 12 - Top edge and inner touch for wings

STEP 14 - Both wings done

Step 15 - Done! Note accuracy and dihedral ( good word to research!)

Jan Adkins is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, WiFi, and a webcam. Click here to find out more.

MLA 8 Citation
Adkins, Jan. "Flat Paper Flight." Nonfiction Minute, iNK Think Tank, 9 Apr.
2018, www.nonfictionminute.org/the-nonfiction-minute/flat-paper-flight.

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Are You as Smart as an Elephant?

1/14/2022

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Peggy Thomas
Curiosity Queen:
writing science, history, and everything in between

Question: If your favorite snack was just out of reach, what would you do?

That’s what Preston Foerder, who studies animal behavior, asked Kandula, a male Asian elephant at the Smithsonian National Zoological Park in Washington, D.C. Scientists have always thought that using a tool to solve a problem was a sign of higher intelligence. They also thought that only humans were tool users. But then Jane Goodall discovered chimps using sticks to fish termites out of a hole, and ravens were observed making hooks to nab a treat. People who’ve worked with elephants have long known that they are highly intelligent, but no one ever tested an elephant’s ability to use a tool to solve a problem.

To set up the experiment, Preston skewered Kandula’s favorite fruits on a branch and suspended it well out of trunk reach. Then he scattered potential tools such as long bamboo sticks and a heavy-duty plastic cube around the yard.

At first Kandula just stared at the fruit longingly. Occasionally he picked up a stick, but only played with it. On the seventh trial, Kandula got an idea. He rolled the cube several yards so it was beneath the fruit. He placed his two front feet on the cube, stretched his trunk as high as he could, and plucked the fruit off the branch. The next day, as soon as Preston suspended the fruit, Kandula was already shoving his cube into place. He seemed to enjoy his new tool. He used it to peek over walls, to check out birds in a nearby tree, and to eat blossoms off another tree that grew outside his yard.

Later, Kandula showed off by using a tractor tire and then a large ball as a stool. He even figured out that if he stacked one small block on top of another he might be able to reach higher fruit. Although he came up short (he needed to stack 3 blocks), he still showed that his brain was working out the problem.

So, congratulations! If you said you’d use a stool to reach your favorite snack, then you are as smart as an elephant.

Through carefully planned and executed games or problems that they give to elephants to test their intelligence, an organization called Think Elephants International has started to explore how animals think. For more information, click here.

Peggy Thomas is co-author of Anatomy of Nonfiction, the only writer’s guide to crafting true stories for children. She is currently working on a book about elephant intelligence. To learn more, visit her website.
Peggy Thomas is a member of iNK's Authors on Call and is available for classroom programs through FieldTripZoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Thomas, Peggy. “Are You as Smart as an Elephant?.” Nonfiction Minute, iNK Think Tank, 17 Nov. 2017, www.nonfictionminute.org/are-you-as-smart-as-an-elephant?

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Hopping Ahead of Climate Change

What Can You Learn from a Holiday Light and a Glass Cup?

The Mystery of the Alternating Nostrils

Flat Paper Flight

Jan Adkins is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, WiFi, and a webcam. Click here to find out more.

Are You as Smart as an Elephant?

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