Inventions

Every day it seems, new inventions surface that promise to add value to our day-to-day lives. But did you know, many of the inventions we interact with daily were developed entirely by accident? 

Take the microwave, for instance. This accidental invention was developed by engineer Percy Spencer who, upon experimenting with a microwave-emitting magnetron, found that the candy bar in his pocket had begun to melt. Spencer was then able to harness this radiation into the microwave we use today to make snack time a speedy process!

Perhaps one of today’s most well-known accidental inventions, the potato chip, was born when a customer kept requesting that his french fries be sliced thinner and made crispier. Though chef George Crum responded with the chips as a joke, they quickly became a favorite snack worldwide! 

Even the match is a result of accidental invention. When pharmacist John Walker was stirring chemicals, he noticed that the end of his stirring stick had dried into a hardened lump. When attempting to scrape the dried residue off, a flame sparked, and so did Walker’s idea to turn this accident into a helpful tool!

So, the next time your science experiment doesn’t go as planned, or you burn what you have cooked on the stove, keep in mind that some of today’s most valued inventions were discovered when the inventor least expected it!

What is the main idea of this passage?

Why didn't Alice like her sister's book? 

What was Alice doing right before she saw the rabbit? 

Adapted from "The Tongue-Cut Sparrow" in Japanese Fairy Tales (1904, trans. Teresa Peirce Williston)

A long time ago, in a little old house in a little old village in Japan lived a little old man and his little old wife.

One morning when the old woman slid open the screens that in that era formed the sides of all Japanese houses, she saw, on the doorstep, a poor little sparrow. She took him up gently and fed him. Then she held him in the bright morning sunshine until the cold dew was dried from his wings. Afterward she let him go, so that he might fly home to his nest, but he stayed to thank her with his songs.

Each morning, when the pink on the mountain tops told that the sun was near, the sparrow perched on the roof of the house and sang out his joy. The old man and woman thanked the sparrow for this, for they liked to be up early and at work. But near them there lived a cross old woman who did not like to be awakened so early. At last she became so angry that she caught the sparrow and cut his tongue. Then the poor little sparrow flew away to his home, but he could never sing again.

When the kind woman knew what had happened to her pet she was very sad. She said to her husband, "Let us go and find our poor little sparrow." So they started together, and asked of each bird by the wayside, "Do you know where the tongue-cut sparrow lives? Do you know where the tongue-cut sparrow went?"

In this way they followed until they came to a bridge. They did not know which way to turn, and at first could see no one to ask. At last they saw a bat hanging head downward, taking his daytime nap. "Oh, friend bat, do you know where the tongue-cut sparrow went?" they asked.

"Yes. Over the bridge and up the mountain," said the bat. Then he blinked sleepy eyes and was fast asleep again.

They went over the bridge and up the mountain, but again they found two roads and did not know which one to take. A little field mouse peeped through the leaves and grass, so they asked him, "Do you know where the tongue-cut sparrow went?"

"Yes. Down the mountain and through the woods," said the field mouse.

Down the mountain and through the woods they went, and at last came to the home of their little friend.

When he saw them coming the poor little sparrow was very happy indeed. He and his wife and children all came and bowed their heads down to the ground to show their respect. Then the sparrow rose and led the old man and the old woman into his house, while his wife and children hastened to bring them boiled rice, fish, and cress.

After they had feasted, the sparrow wished to please them still more, so he danced for them what is called the "sparrow dance."

When the sun began to sink, the old man and woman started for home. The sparrow brought out two baskets. "I would like to give you one of these," he said. "Which will you take?" One basket was large and looked very full, while the other one seemed very small and light.

The old people so thought they would not take the large basket, for that might have all the sparrow's treasure in it, so they said, "The way is long and we are very old, so please let us take the smaller one."

They took it and walked home over the mountain and across the bridge, happy and contented. When they reached their own home they decided to open the basket and see what the sparrow had given them. Within the basket they found many rolls of silk and piles of gold, enough to make them rich, so they were more grateful than ever to the sparrow.

The cross old woman who had cut the sparrow's tongue was peering in through the screen when they opened their basket. She saw the rolls of silk and the piles of gold, and planned how she might get some for herself.

The next morning she went to the kind woman and said, "I am so sorry that I cut the tongue of your sparrow. Please tell me the way to his home so that I may go to him and tell him I am sorry."

The kind woman told her the way and she set out. She went across the bridge, over the mountain, and through the woods. At last she came to the home of the little sparrow. He was not so glad to see this old woman, yet he was very kind to her and did everything to make her feel welcome. They made a feast for her, and when she started home the sparrow brought out two baskets as before. Of course the woman chose the large basket, for she thought that would have even more wealth than the other one.

It was very heavy, and caught on the trees as she was going through the wood. She could hardly pull it up the mountain with her, and she was all out of breath when she reached the top. She did not get to the bridge until it was dark. Then she was so afraid of dropping the basket into the river that she scarcely dared to step. When at last she reached home she was so tired that she was half dead, but she pulled the screens close shut, so that no one could look in, and opened her treasure.

Treasure indeed! A whole swarm of horrible creatures burst from the basket the moment she opened it. They stung her and bit her, they pushed her and pulled her, they scratched her and laughed at her screams. At last she crawled to the edge of the room and slid aside the screen to get away from the pests. The moment the door was opened they swooped down upon her, picked her up, and flew away with her. Since then nothing has ever been heard of the old woman.

Which of the following lines demonstrates that the sparrow is polite to people who visit him, even if they have been mean to him?

Based on the order of the planets, which planet would you assume would be the warmest? 

Passage and table adapted from "Why Leaves Change Color" on "Northeastern Area," a website by the USDA Forest Service. <https://www.na.fs.fed.us/fhp/pubs/leaves/leaves.shtm>.

There are two main types of trees: coniferous trees and deciduous trees. Coniferous trees have small, needle-like leaves. They keep these leaves all year. One example of a coniferous tree is a pine tree, which has green needles during all seasons. In contrast, deciduous trees lose their leaves every autumn. Before these leaves drop and blow away, they change from green to colors like red, orange, yellow, and brown.

Have you ever wondered why deciduous leaves change color in the fall? This color change is caused by a chemical process in the cells of tree leaves.

Green leaves are green because they contain a green molecule, chlorophyll. This is a very important molecule in the natural world. Leaves use this molecule to turn carbon dioxide, sunlight, and water into sugar and oxygen in a process called “photosynthesis.” So, chlorophyll lets the plant store energy as sugar, which it can use as food. It also lets the plant provide food for anything that eats it, like a cow, a bird, or even a human! 

So, what does chlorophyll, a green molecule, have to do with autumn leaf colors? Deciduous leaves also contain molecules of other colors, but the chlorophyll in the leaves covers them up in the summer. In the fall, deciduous trees stop making chlorophyll. Eventually there is no more chlorophyll in their leaves. The colors of the other molecules show through. The colors of these other molecules are the colors we see in autumn leaves. The next time you see colorful leaves in the fall, you’ll know more about the chemistry at work!

Which of the following would you expect to be listed in the left column of the table in a horizontal row with the color “Green” in the right column of the table?

Passage and table adapted from "Why Leaves Change Color" on "Northeastern Area," a website by the USDA Forest Service. <https://www.na.fs.fed.us/fhp/pubs/leaves/leaves.shtm>.

There are two main types of trees: coniferous trees and deciduous trees. Coniferous trees have small, needle-like leaves. They keep these leaves all year. One example of a coniferous tree is a pine tree, which has green needles during all seasons. In contrast, deciduous trees lose their leaves every autumn. Before these leaves drop and blow away, they change from green to colors like red, orange, yellow, and brown.

Have you ever wondered why deciduous leaves change color in the fall? This color change is caused by a chemical process in the cells of tree leaves.

Green leaves are green because they contain a green molecule, chlorophyll. This is a very important molecule in the natural world. Leaves use this molecule to turn carbon dioxide, sunlight, and water into sugar and oxygen in a process called “photosynthesis.” So, chlorophyll lets the plant store energy as sugar, which it can use as food. It also lets the plant provide food for anything that eats it, like a cow, a bird, or even a human! 

So, what does chlorophyll, a green molecule, have to do with autumn leaf colors? Deciduous leaves also contain molecules of other colors, but the chlorophyll in the leaves covers them up in the summer. In the fall, deciduous trees stop making chlorophyll. Eventually there is no more chlorophyll in their leaves. The colors of the other molecules show through. The colors of these other molecules are the colors we see in autumn leaves. The next time you see colorful leaves in the fall, you’ll know more about the chemistry at work!

How does the information presented in the table relate to the information presented in the passage?

Passage and table adapted from "Why Leaves Change Color" on "Northeastern Area," a website by the USDA Forest Service. <https://www.na.fs.fed.us/fhp/pubs/leaves/leaves.shtm>.

There are two main types of trees: coniferous trees and deciduous trees. Coniferous trees have small, needle-like leaves. They keep these leaves all year. One example of a coniferous tree is a pine tree, which has green needles during all seasons. In contrast, deciduous trees lose their leaves every autumn. Before these leaves drop and blow away, they change from green to colors like red, orange, yellow, and brown.

Have you ever wondered why deciduous leaves change color in the fall? This color change is caused by a chemical process in the cells of tree leaves.

Green leaves are green because they contain a green molecule, chlorophyll. This is a very important molecule in the natural world. Leaves use this molecule to turn carbon dioxide, sunlight, and water into sugar and oxygen in a process called “photosynthesis.” So, chlorophyll lets the plant store energy as sugar, which it can use as food. It also lets the plant provide food for anything that eats it, like a cow, a bird, or even a human! 

So, what does chlorophyll, a green molecule, have to do with autumn leaf colors? Deciduous leaves also contain molecules of other colors, but the chlorophyll in the leaves covers them up in the summer. In the fall, deciduous trees stop making chlorophyll. Eventually there is no more chlorophyll in their leaves. The colors of the other molecules show through. The colors of these other molecules are the colors we see in autumn leaves. The next time you see colorful leaves in the fall, you’ll know more about the chemistry at work!

According to the passage, leaves turn color in the fall because __________.

Passage 2: Adapted from "Cyanocitta cristata: Blue Jay" in Life Histories of North American Birds, From the Parrots to the Grackles, with Special Reference to Their Breeding Habits and Eggs by Charles Bendire (1895)

The beauty of few of our local birds compares to that of the Blue Jay. One can’t help admiring them for their amusing and interesting traits. Even their best friends can’t say much in their favor, though. They destroy many of the eggs and young of our smaller birds. A friend of mine writes, “The smaller species of birds are utterly at [the Blue Jay’s] mercy in nesting time. Few succeed in rearing a brood of young. It is common in the woods to hear Vireos lamenting for their young that the Jay has forcibly carried away. Vast numbers of eggs are eaten and the nests torn up.”

Still, I cannot help admiring Blue Jays, because they have good traits as well. They are cunning, inquisitive, good mimics, and full of mischief. It is difficult to paint them in their true colors. Some writers call them bullies and cowards. Perhaps they deserve these names at times, but they possess courage in the defense of their young. But it is unfortunate that they show so little consideration for the feelings of other birds.

It is astonishing how accurately the Blue Jay is able to imitate the various calls and cries of other birds. These will readily deceive anyone. They seem to delight in playing tricks on their unsuspecting neighbors in this manner, apparently out of pure mischief. They are especially fond of teasing owls, and occasionally hawks; however, sometimes this has disastrous results for the Blue Jays.

Why can we infer that imitating the calls of hawks and owls occasionally “has disastrous results for the Blue Jays,” as the passage says in its last line?

Passage One

Ecuador, in South America, is home to 417 types of frogs and toads. Many of these species, or types of frogs, are at risk of dying out. In the last 50 years, many amphibian species have gone extinct. Salamanders, frogs, and toads are all amphibians. Amphibians are animals that spend part of their life in water and part on land, and have backbones. Amphibians must live near water. Amphibian habitats can be found in forests, woodlots, meadows, springs, wetlands, streams, rivers, lakes, ponds, bogs, marshes. Frogs and toads are in trouble because their habitats are being destroyed as trees are being cut down to make room for farms and roads. Wetland spaces where frogs live are being drained and paved over. As these spaces are removed, the places frogs, toads, and salamanders can live shrink. 

Amphibians also absorb pollution easily, because they breathe through their skin. Amphibians are usually the first to disappear when an environment is under threat from pollution. Due to pollution, some frogs are born with deformed, or wrongly shaped, body parts, such as extra legs and eyes. Frogs with deformed body parts are a clue for scientists that an environment is suffering. Between the destruction of their habitats and risks to frogs from pollution, frogs are at risk of endangerment and extinction. Scientists are working to save amphibians. Scientists want the government to pass laws that protect amphibian habitats and limit pollution. 

Passage Two

My name is Maria and I am an amphibian conservation biologist. This means I am a scientist who studies and protects frogs, toads, and salamanders.  My job is to protect amphibians and their natural habitats, share this knowledge with the public,  and research ways to help reintroduce frogs in captivity back into the wild. I have the best job in the world.  I work in a zoo, but I often travel to places like Brazil to observe amphibians in their natural habitats in the wild. Brazil, for example, has 1,022 different types of frogs, toads and salamanders! In my work at the zoo, I specialize in only a small portion of that number. Here in the zoo, we have many amphibians in our care because some or all of their natural habitats, or homes, were destroyed.  We are not alone in our work to protect amphibians. Many people, in many kinds of jobs, are helping protect amphibians and their habitats. I partner with other scientists and lawyers, like my friend Fernanda,  to help create laws that best support the conservation, or protection, of amphibians. Fernanda is an environmental lawyer who works to create laws that protect diverse wildlife. She, in turn, needs to partner with government workers to help get laws passed. Together, our goal is to work together to build a world where these amphibians have safe space to live outside of the zoo, in their natural habitat, protected from pollution or loss of space. We are working with a facility in Brazil to build a safe wild space for amphibians to be released from the zoo and into a space where they can thrive. The new habitat will be a protected wetland for these amphibians.

According to passage 1, what is the main threat for frogs and toads?