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Here Come the Cicadas

4/30/2019

Laurence Pringle
celebrating nature, inspiring good writing

Almost every spring an amazing event in nature happens in parts of the United States. Huge numbers of insects called periodical cicadas emerge from the soil. For a few weeks they fill the days with loud buzzing calls.

Every summer you can hear the calls of some kinds of cicadas, but periodical cicadas are different. They exist only in the eastern two-thirds of the United States, and have the longest of all insect lives. Some periodical cicadas live 13 years, others 17 years, with nearly all of that time spent underground. Young cicadas, called nymphs, sip water and nutrients from tree roots. The nymphs count the years, probably by sensing changes in tree sap, as it is affected by the seasons of each year.

When their countdown ends and soil warms in the spring, millions of cicada nymphs dig out. They climb posts, bushes, and trees, and cling there. Their nymph "skins" split open and adult cicadas wriggle free. Finally, after many years underground, they are out in the sunshine. They can fly, and the buzzing noises of males attract females. It is a noisy and hectic time in their lives. They have just a few weeks to mate and produce the next generation. Once females lay eggs in tree twigs, all of the adults die. Soon after, tiny nymphs hatch from the eggs. They drop to the soil, borrow in, and begin to sip juices from tree roots. The nymphs grow slowly, counting the years until they will have their own time in the sun.

Nearly every year, one or more populations, called broods, of periodical cicadas emerge. Seventeen year cicadas live mostly in the Northeast and Upper Midwest. Thirteen year cicadas are most common in the South and Lower Midwest. Some broods emerge in parts of just a few states. Some years, a more widespread brood emerges in parts of fifteen states. Notice that I say "parts" of states. These cicadas don't roam around. The nymphs go underground in the same places where their parents emerged. You will find them in one town but not another, in one neighborhood but not another.

Some people call cicadas "locusts," but locusts are a kind of grasshopper that eats plants. Cicadas do not chew on plants. They are harmless, fascinating creatures. And, once in a great while, they give us a rare and awe-inspiring animal spectacle.

A time sequence photo of a cicada molting (shedding its skin). Wikimedia Commons

Face to face with a periodical cicada: you can tell because these remarkable North American insects have black bodies and red eyes. All cicadas have five eyes, with three tiny ones that form a triangle between two big ones. Wikimedia Commons

Visit the great website, Cicadamania, which has high praise for this book: "Definitely the best cicada book for kids. Adults will appreciate it as well, as it is well written, factually accurate, and beautifully illustrated."
You can read more about Larry's fascination for these creatures on his website.

MLA 8 Citation
Pringle, Laurence. "Here Come the Cicadas." Nonfiction Minute, iNK Think Tank,
23 Apr. 2018, www.nonfictionminute.org/the-nonfiction-minute/
Here-Come-the-Cicadas.

3 Comments

How Did Building Bikes Help the Wright Brothers Invent the Airplane?

4/10/2019

3 Comments

Mary Kay Carson
Storyteller of True Adventures and Real Discoveries

As any paper airplane pilot knows, getting into the air and staying up in the air are two different things. An out-of-control, unstable paper airplane quickly ends up on the floor—no matter how powerfully you threw it. Controlling an airplane was the problem yet to be solved in the late 1890s. Many of the inventors racing to be the first to build a powered flying machine didn’t understand that controlling an airplane is different from controlling other vehicles of the time. But the Wright Brothers did.

Unlike a car or boat, an airplane moves in three directions: pitch, yaw, and roll. Stable flight takes correctly controlling all three.

When you steer a boat, you move a rudder to go left or right. This is yaw. Turn a rudder on its side and you get an elevator, which controls a submarine as it dives and surfaces. This is pitch. Airplanes also have elevators and rudders. But flying takes more than up-down and right-left control. An airplane also tilts side to side, in a motion called roll. Think of a jet tilting its wings as it changes direction. Or a little kid zooming around with tilted arms spread wide.

Controlling the roll of an airplane was the secret to stable, sustained flight. And this is where the Wright Brothers had an edge. They built bicycles. A bicycle is an unstable vehicle when it isn’t moving. In fact, it falls over. A moving bicycle is much easier to balance than a stopped one. And steering a moving bicycle is more than just turning the handlebars right or left. The rider must lean into turns, tilting his body to keep balanced. Sound familiar? It’s the same kind of motion as roll.

Orville and Wilbur Wright knew about roll and worked on a way to control it even while experimenting with gliders. They controlled roll through wing-warping, a system of cables attached to the wings that twisted their shape, like twisting an empty aluminum foil box. The pilot controlled which way the wings warped by moving his hips as he lay on the airplane in a kind of cradle. Soon ailerons, those flaps on the backside of airplane wings, became the controller of roll. But the brothers of the Wright Cycle Company figured it out—and flew—first.

If you look at pitch, roll and yaw together you can see that each type of motion helps control the direction and level of the plane when it is flying. The ailerons raise and lower the wings. The pilot controls the roll of the plane by raising one aileron or the other with a control wheel. The rudder works to control the yaw of the plane. Pressing the right rudder pedal moves the rudder to the right. This yaws the aircraft to the right. Used together, the rudder and the ailerons are used to turn the plane. The elevators which are on the tail section are used to control the pitch of the plane. Lowering the elevators makes the plane nose go down and allows the plane to go down. By raising the elevators the pilot can make the plane go up.

First successful flight of the Wright Flyer, by the Wright brothers. The machine traveled 120 ft (36.6 m) in 12 seconds. Orville Wright was at the controls of the machine, lying prone on the lower wing with his hips in the cradle which operated the wing-warping mechanism. Wilbur Wright ran alongside to balance the machine. Library of Congress

Mary Kay Carson's The Wright Brothers for Kids: How They Invented the Airplane, 21 Activities Exploring the Science and History of Flight tells the amazing true story of how two bicycle-making brothers from Ohio, with no more than high-school educations, accomplished a feat on the beaches of Kitty Hawk, North Carolina, that forever changed the world.

MLA 8 Citation
Carson, Mary Kay. "How Did Building Bikes Help the Wright Brothers Invent the
     Airplane?" Nonfiction Minute, iNK Think Tank, 28 Mar. 2018,
     www.nonfictionminute.org/the-nonfiction-minute/
     How-Did-Building-Bikes-Help-the-Wright-Brothers-Invent-the-Airplane.

3 Comments

Ants in a Jam

4/9/2019

1 Comment

Sarah Albee
Celebrating the History of Science
and the Science behind History

Imagine you’re driving home from your favorite take-out restaurant when you suddenly encounter a giant boulder in the middle of the road. With luck, the person at the wheel has time to slam on the brakes and then drive around it.

Scientists are refining a technology that helps cars avoid collisions and traffic jams. Cars will be programmed to “see” a roadblock or sudden slowdown before the driver does. And some of this technology is based on . . . ants.

Leafcutter ants, to be specific. Leafcutters can be any of a number of species of ants equipped with powerful mandibles (jaws). They travel in long lines through the rainforest, leaving a scent along the trail to find their way back. After an ant saws a chunk out of a leaf, it flings it over its back and then joins the super-highway of nest-mates heading back to the nest. Once there, the ant’s colleagues chew the vegetation into a pulp and then mix it with ant poop and fungus spores. The ants eat the resulting fungus that grows from the decomposed goop.

According to a study in the Journal of Experimental Biology, scientists blocked the path and created a narrow passageway between leafcutter ants and their nest, to see what the ants would do. Not only did the ants at the front show the ants behind them an efficient route back to the nest, but the chain of ants also somehow communicated, ant by ant, the need to carry a smaller piece of leaf to fit through the narrower passage the scientists had created.

And none of them bumped into anything, even while lugging leaves ten times their body weight. By working together and adapting quickly, the ants communicated information and reinforced the trail using what scientists call “distributed intelligence.”

And ants don’t just help car engineers. Scientists in other fields have been studying ant traffic patterns for all sorts of different systems where massive amounts of interacting units have to move around without crashing into one another. Besides traffic jams, scientists are studying ways to apply ant-like ingenuity to fields of study such as molecular biology and telecommunications.

Sara Albee's book, Why'd They Wear That?, was published by National Geographic in 2015. Get ready to chuckle your way through centuries of fashion dos and don'ts! In this humorous and approachable narrative, you will learn about outrageous, politically-perilous, funky, disgusting, regrettable, and life-threatening creations people actually wore in public.

MLA 8 Citation
Albee, Sarah. "Ants in a Jam." Nonfiction Minute, iNK Think Tank, 4 Dec. 2017, www.nonfictionminute.org/ Ants-in-a-Jam.

1 Comment

Here Come the Cicadas

How Did Building Bikes Help the Wright Brothers Invent the Airplane?

Ants in a Jam

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