If I asked you what grain is the most harvested in the world, you’d probably answer either wheat or rice. But the answer is actually corn, more accurately called ‘maize.’ This nutritious crop that originated in Mexico feeds not only people but also animals around the world. We’re used to the wonderfully tender sweet corn harvested in late summer and early autumn, but most maize is actually field corn, more starchy than sweet and used as animal feed or to make cornmeal and flour. For a long time, biologists puzzled about the origins of this important crop. There is no wild plant that looks anything like modern corn, which is actually a giant grass. The closest relative is a scrawny branching plant with hard dark seeds called teosinte. It seems a huge jump from teosinte to corn, yet geneticist George Beadle found in the 1930s that corn and teosinte have the same number of chromosomes and could be crossbred to produce hybrids. With the limited tools available at that time, Beadle deduced that only about five genes were involved in creating the differences between teosinte and corn. Fast forward to modern times, when scientists can look directly at DNA and analyze every detail of its structure. We now know that Beadle came very close to the truth—about five regions in the DNA seem to control the major differences between teosinte and corn. For example, these two plants look so very different, yet just one single gene turns a branched plant into a single stalk, like a stalk of corn. Another single gene controls one of the most dramatic and certainly most important traits for farmers—the nature of the seeds and their stalk. In teosinte, each seed has a hard covering. Just one gene eliminates the hard covering and produces a stalk bearing exposed seeds, like an ear of corn. Scientists now use maize as a perfect example of two major ways evolution happens. One way is through major sudden jumps, like the change from a branching plant to a single stalk. The other is the more gradual kind of change that has led to the thousands of different kinds of maize grown by farmers today. There are probably hundreds of varieties of sweet corn and thousands of varieties of field corn. Think about that the next time you bite into a nice crunchy taco made from a corn tortilla.
 Here you can see the major differences between a teosinte plant and a corn plant. Credit:TeosinteCornUOR  Corn was a very important crop for homesteaders in the American West, used both to feed themselves as well as their animals. Read about it in Homesteading: Settling America's Heartland, revised and expanded edition, Mountain Press, 2013. Dorothy Hinshaw Patent 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 Patent, Dorothy Hinshaw. "Amazing Maize." Nonfiction Minute, iNK Think Tank, 8 June 2018, www.nonfictionminute.org/the-nonfiction-minute/Amazing-Maize. 
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 The polar jet stream can travel at speeds greater than 100 miles per hour (160 km/h). Here, the fastest winds are colored red; slower winds are blue. NASA/Goddard Space Flight Center No one can honestly deny that our climate has been changing in recent years. Because of record drought, California has only a year’s water supply stored in its reservoirs. Wildfires have become an annual threat throughout much of the west, while the Midwest and East Coast have experienced record-setting winters. These problems are due to complex interactions among temperature, winds, and water currents. A major change is the warming of the atmosphere. The earth’s atmosphere has been getting warmer since the late 1800s, when factories started spewing out carbon dioxide. Because natural variations also affect the temperature, a graph showing the temperature over time is a jagged line. But the trend is consistently upward and follows the graph of increasing carbon dioxide in the atmosphere due to human activities. That’s strong enough evidence that we are at least a large part of the problem, and the vast majority of climate scientists are urging countries of the world to reduce their carbon dioxide emissions. A major player in the world’s weather is the jet stream, which helps circulate the atmosphere around the world about every two weeks. This flow of fast-moving air speeds across North America from west to east, separating cold arctic air from warmer, more southerly air. The jet stream used to run in a fairly direct arc across the northern United States. But in recent years it has become less stable, dipping southward in the eastern U.S. to bring frigid winters to the Northeast while arching northward in the West, carrying warm, dry air there. Scientists believe that the rapid melting of the Arctic ice brought about by global warming is part of the cause for the jet stream’s instability. However, climate trends are controlled more by the oceans. Scientists estimate 95% of the heat from global warming is being stored in the oceans, increasing water temperatures even into the depths. As global warming continues, so will climate change. The melting of sea ice and glaciers is already raising the sea level. While scientists don’t blame climate change for devastating Hurricane Sandy, Sandy’s extreme coastal flooding was made worse by the increase in sea level that’s already occurred. As time goes on, coastal cities around the world will be at increasing risk for more severe storm damage. Because warm air holds more moisture than cold air, storms are becoming more severe, increasing blizzards and flooding storms. Some agricultural regions that depend on reliable rainfall may soon be unable to grow crops, disrupting the food supply. Climate change is complicated, but because it affects us all, we need to learn about it. The Environment Protection Agency has questions and answers about climate change.
 Calculations of global warming prepared in or before 2001 from a range of climate models. The projections assume no action is taken to reduce emissions.  Yellowstone National Park’s majestic geologic wonders and remarkable wildlife draw millions of visitors each year. But there was a time when these natural treasures were in great danger, all because after years of unrestricted hunting, one key piece of the puzzle had been eliminated—the wolf. Now, more than a decade after scientists realized the wolves’ essential role and returned them to Yellowstone, the park’s natural balance is gradually being restored. Dorothy Hinshaw Patent's text supplemented by spectacular full-color photographs show the wolves in the natural habitat that was almost lost without them. Click here to find out more. Dorothy Hinshaw Patent 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 Patent, Dorothy Hinshaw. "Climate Change: The Facts and the Consequences." Nonfiction Minute, iNK Think Tank, 17 Apr. 2018, www.nonfictionminute.org/the-nonfiction-minute/ Climate-Change-The-Facts-and-the-Consequences.  
People are confused. They hear the terms “global warming” and “climate change” tossed about without much explanation. We all talk about the weather, but what does that word actually mean, and how does it relate to these other terms? NASA defines global warming: “Global warming is the increase in Earth’s average surface temperature due to rising levels of greenhouse gases.” So global warming is a measurable statistic. Record the temperature at many sites on Earth for a given year, add them up, and divide to get an average. Rising levels of greenhouse gases are also well measured. The famous “Keeling curve” of atmospheric CO2 begun in Hawaii in 1957 is the best example. Climate change is more complicated. Climate change is a long-term change in the Earth’s climate and includes measures of the atmosphere, oceans, land, cryosphere (snow and ice), wind, precipitation, deforestation, wildfire, and more, as well as temperature. So, climate change is a more inclusive measure of many factors changing the Earth system, which is very different from a single statistic like the rise in temperature from global warming. Then there’s the weather. What, exactly is the weather? That term refers to what’s going on in the atmosphere at a particular time and place. It includes the air temperature, wind speed, humidity, and precipitation. Weather happens day to day, while global warming is shown by recording day-to-day temperatures over a long period of time. Climate change is a long-term process that can result in drastic changes in conditions on our planet. To sum up: Weather refers to what’s happening in the atmosphere at a given time and place over the course of days to months. Global warming refers to an upward trend in the average temperature over a period of years to decades. Climate change is a long-term process that can be influenced by changes in the average temperature but includes many other factors. To watch a brief but amazing video of the affect of global warming and climate change over the next 20 years, click here.  Dorothy's recent book The Call of the Osprey, has been chosen as a Best Science Trade Book for Students by the National Science Teachers Association. It covers research being done in Western Montana by scientists at the University of Montana. Starting in the late 1800's, Butte, MT, at the headwaters of the Clark Fork River, was the largest copper mine in the U.S. The major result of the mining was two-fold—the electrification of America and the largest Superfund cleanup site in the U.S. Call of the Osprey deals not only with current research but also with the history of Butte and the lives of the scientists involved in the research. Click here to find out more. Dorothy Hinshaw Patent 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 Patent, Dorothy Hinshaw. "Defining Weather, Global Warming, and Climate Change." Nonfiction Minute, iNK Think Tank, 16 Apr. 2018, www.nonfictionminute.org/the-nonfiction-minute/ Defining-Weather-Global-Warming-and-Climate-Change.  
Have you heard about the “butterfly effect,” the idea that one small change can bring about big changes over time? This idea is important in the study of ecology, which deals with the interactions of living things and their environments. Each element of an ecosystem has its place. When one element is eliminated, it affects everything else. The Yellowstone ecosystem centered in Yellowstone National Park provides a great example. Late in the 20th century, biologists were worried about the aspen trees there. Aspens occur in clusters that are actually clones growing up from shared root systems. Some of the Yellowstone clones were hundreds of years old, but the old, dying trees weren’t being replaced by strong young shoots. It looked like they might just die out, and no one was sure why. When a severe drought in 1988 led to big wildfires in the park, the idea that fire might stimulate aspen growth proved wrong. Perhaps the elimination of wolves from the region in the early 20th century was to blame. Wolves? New trees? How could that be? Without wolves, the behavior of the Yellowstone elk had changed. No predators. No worry. So the elk became lazy, acting like cows, lying around in shaded areas along the rivers and creeks, munching contentedly on the juicy fresh growth of the willows and aspens. In 1995, after much political battling, wolves were reintroduced into Yellowstone. The wolf population grew and the elk learned to be on the alert. As the wolves’ favorite food, the elk had to change their behavior to survive—no more relaxing by a stream where wolves could easy sneak up and make a meal of them! They had to move around and spend more time in open places where watching for hungry wolves was far easier. The wolves are changing the Yellowstone landscape in positive ways. The aspens and willows are coming back. Beavers, which had almost disappeared from some parts of the park, are returning. These rodents feed on aspens and willows and use them to build their dams and lodges. Beaver dams create ponds, and the ponds provide homes for hundreds of species of plants and animals, from algae and water striders to ducks and muskrats. The willows and aspen trees around the pond are nesting sites for songbirds and homes for insects and spiders, all thanks to the wolf. Welcome back, wolves!  This aspen shoot has been chewed to bits by elk. Dan Hartman  These aspen shoots have been allowed to grow strong and tall. Dan Hartman  Wolves on the hunt in Yellowstone. Dan Hartman  Now that the aspens and willows are returning, so are the beavers. Dan Hartman  Dorothy Hinshaw Patent's book, When the Wolves Returned: Restoring Nature's Balance in Yellowstone, is an IRA/CBC Teachers' Choices book, an ALA Notable Children's Book, A Book Sense Pick, and an Outstanding Science Trade Book for Children, as well as receiving the Orbis Pictus Honor Book Award. Booklist calls it "A great choice for elementary units about science and environmental protection," and Kirkus gave it a starred review. Click here to read the reviews. Dorothy Hinshaw Patent 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 Patent, Dorothy Hinshaw. "Everything Is Connected: The Butterfly Effect and the Wolf." Nonfiction Minute, iNK Think Tank, 27 Mar. 2018, www.nonfictionminute.org/the-nonfiction-minute/ Everything-is-Connected-The-Butterfly-Effect-and-the-Wolf.  
Do you know that the Plains Indians lived in North America for centuries before they got horses? These people were nomads, moving from place to place through the seasons as they sought protection from winter weather and hunted for buffalo, their main source of food. Can you imagine how difficult it was, walking many miles in soft moccasins across the rough prairie ground with only dogs to help carry their possessions? The dogs dragged goods on a travois, a set of wooden poles strapped together. A big, strong dog could manage a load of just seventy-five pounds or less. It took an Indian band a long time to get from one place to another, and the people couldn’t bring very many things along. Then, in the 1500s, Spanish explorers and settlers brought horses with them to North America. Indian slaves in the Southwest took care of the horses on Spanish ranches but were forbidden to ride them. Of course they figured out how useful horses were, and soon the Apache tribe had horses. In 1680, the Indians rebelled against the Spanish, driving them out of New Mexico and forcing them to leave many horses behind. From then on, horses spread northward and by 1750, tribes all the way into Canada had horses. These powerful animals revolutionized Indian culture. With horses, the Indians could ride instead of walk. They could bring along more goods, as a horse could drag a travois load of three hundred pounds. Just five horses could transport everything needed by a family, including enough buffalo hides to make a big, comfortable tepee. Old or sick family members could be carried along on a travois as well. Just as the Indians were embracing the horse, European Americans were moving into Indian lands, forcing some tribes to move westward onto the prairie and adopt the horse culture. Within a generation, Indians became supreme horsemen and used horses to hunt buffalo and to wage warfare. They fought against one another as well as against the U.S. Army, which was trying to clear the way for white settlers to make their homes on the prairie. By the late 1800s, the Plains tribes had been beaten and forced to live on reservations. The Indians still value their horses, competing with them in rodeos and races as well as for recreation and transportation.  Horses made life much easier for the Plains Indians. People could ride the horses at the same time the horses pulled the travois that carried their goods. Moving camp, Edward Curtis, courtesy Library of Congress  The annual Crow Fair draws twenty to thirty thousand Indians from Canada and the U.S. to eastern Montana to celebrate and compete. Every morning, a parade of Indians showing off their beautiful costumes and horse gear passes through the camp. Wm. Munoz  These Crow chiefs proudly show off their costumes and beadwork for photographer Edward Curtis, who documented many Indian cultures during the late nineteenth and early twentieth centuries. Edward Curtis. Courtesy Library of Congress.  Every winter, a group of young Indians show their pride in their cultural traditions by challenging themselves to repeat the frigid 287-mile ride of Lakota Chief Big Foot and his band to Wounded Knee, South Dakota, where they were massacred by the U.S. Army in December, 1890. Indian Teens, Wm. Munoz  Dorothy Hinshaw Patent says about her book, The Horse and the Plains Indians: "This book was truly a labor of love and respect. Within a few years of acquiring horses after the Spanish brought them to America, Indians became among the greatest horsemen in the world and created vibrant new horse-related aspects to their cultures. I wanted to communicate these achievements to young people and to show them that despite all they have suffered at the hands of European American culture, the Indians heart and soul attachment to horses endures." For more information, click here. Dorothy Hinshaw Patent 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 Patent, Dorothy Hinshaw. "How Horses Revolutionized the Lives of the Plains Indians." Nonfiction Minute, iNK Think Tank, 5 Mar. 2018, www.nonfictionminute.org/the-nonfiction-minute/ How-Horses-Revolutionized-the-Lives-of-the-Plains-Indians.  |
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