What does the author say about Teflon?

The word “grumpy” in paragraph 1 is closest in meaning to

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A large number of inventions require years of arduous research and development before they are perfected. For instance, Thomas Edison had to make more than 1,000 attempts to invent the incandescent light bulb before he finally succeeded. History is replete with numerous other examples of people trying, yet failing to make inventions before they eventually succeeded. Yet some inventions have come about not through hard work but simply by accident.

In most cases, when someone unintentionally invented something, the inventor was attempting to create something else. For example, in the 1930s, chemist Roy Plunkett was attempting to make a new substance that could be used to refrigerate items. He mixed some chemicals together. Then, he put them into a pressurized container and cooled the mixture. By the time his experiment was complete, he had a new invention. It was not a new substance that could be used for refrigeration though. Instead, he had invented Teflon, which is today most commonly used to make nonstick pots and pans. Similarly, decades earlier, John Pemberton was a pharmacist in Atlanta, Georgia. He was attempting to create a tonic that people could use whenever they had headaches. While he was not successful in that endeavor, he managed to invent Coca - Cola, the world - famous carbonated soft drink.

Scientists have also made crucial discoveries by accident when they were conducting experiments. In 1928, Alexander Fleming discovered penicillin, an antibiotic, in this manner. He discovered some mold growing in a dish with some bacteria. He noticed that the bacteria seemed to be avoiding the mold. When he investigated further, he determined some of the many useful properties of penicillin, which has saved millions of lives over the past few decades. Likewise, in 1946, scientist Percy Spencer was conducting an experiment with microwaves. He had a candy bar in his pocket, and he noticed that it suddenly melted. He investigated and learned the reason why that had happened. Soon afterward, he built a device that could utilize microwaves to heat food: the microwave oven.

Question 8: Which title best summarizes the main idea of the passage?

What was keeping Martha inside?

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There is a wide range of organisms by their population whose lives mostly depend on how they hunt or are hunted. And most living organisms have some way of protecting themselves from natural predators. Some mammals, like the platypus, carry internal toxins to transmit to predators via biting or other means, and some plants protect themselves by being poisonous. The African crested rat was originally thought to be poisonous because predators that tried to eat it often became paralyzed. But scientists have recently learned that's not actually the case.

The crested rat chews on the poisonous bark of a certain tree, and then smears the chewed-up substance onto its fur, where a strip of special quill-like hairs soaks up the poisonous mixture. Though similar to a porcupine's, the quills do differ: whereas the porcupine defends itself by poking predators, the African rat uses its quill-like hairs to deliver poison to them. When a predator comes after it, instead of running away, the rat stays put and parts its hair to reveal the strip of fur on its back where the poison is being stored. That raised strip is the first thing that receives a bite, and the poison inside disables the predator. These hair tubes are unusual. In fact, scientists do not know of another animal that uses plant poison in this way.

Scientists are puzzled that the rat doesn't appear to be affected by the poison. Because it affects

heartbeat regulation, understanding how the rat can keep its heart rate regulated effectively while using the poison could help scientists develop new medicines for people with heart trouble. And they hope that those suffering from heart diseases will benefit from this.

What is the main purpose of the passage?

What does the passage imply about the cost of the White House construction?

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Rain pounded down on the roof. I was trying to read but the sound was too loud. I couldn’t help myself from being a little grumpy. I wanted to be outside playing, but the rain was keeping me inside.

My mom had gone to the grocery store, and my dad was spending Saturday at the office. I had planned to spend the day hiking, but Mother Nature decided that today was the perfect day for rain.

It meant that I would have to entertain myself. I spent most of the morning playing with my stuffed animals and reading. I was sitting next to the window staring out when I got a strange idea: why not just go outside anyway?

I put on my boots and a big raincoat and stepped out into the wet world. It was raining hard but it wasn’t cold. All I could hear were raindrops and the wind. I decided to go on my hike anyway.

My feet didn’t make any sound on the wet ground and the forest seemed different. I went to my favourite place and sat down. In the summer, my best friend Ellen and I would come here and sit for hours. It was our special place. All of a sudden, I thought I heard someone shouting my name. I turned and saw Ellen walking up behind me.

“Oh my Gosh! It’s really you, Martha!” she said. “I can’t believe that you are out here right now. I thought I would be the only person crazy enough to go for a walk in the rain.”

I was very happy to have some company. We decided that hiking in the rain was just as fun as hiking in the sunshine. We planned on hiking in the rain again.

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The official residence of the president of the United States is the White House, located at 1600 Pennsylvania Avenue, in Washington, D.C. The Commissioners of the District of Columbia held a meeting in 1792 and decided to hold a contest for the best design for the Presidential House. James Hoban, an architect born in Ireland, was the winner. His bid for the construction of the mansion asked for $200,000, but the final cost of the building came to twice that amount. The work on the project began during the same year, and the grounds of approximately one and a half miles west of the Capitol Hill were chosen by Major Pierre-Charles L’Enfant, who was in charge of city planning. However, the construction continued for several more years, and George Washington had stepped down as president before the building was habitable. When John Adams, the second president of the United States and his wife Abigail moved in 1800, only six rooms had been completed.

The grey sandstone walls of the house were painted white during construction, and the color of the paint gave the building its name. The building was burned on August 24, 1814, and James Hoban reconstructed the house for President James Monroe and his family, who moved there in 1817. The north portico was added to the building in 1829, water pipes were installed in 1833, gas lighting in 1848, and electricity in 1891. In 1948, inspectors announced that the building was so dilapidated that it was beyond repair and suggested that it was cheaper to construct a new one than repair the existing dwelling. However, the national sentiment was to keep the original form intact, and Congress appropriated $5.4 million dollars for repairs. In 1961, Jacqueline Kennedy launched a program to redecorate the rooms and appointed a Fine Arts Committee to make choices of furnishing and colors.

The house of the president accords its residents a great deal of space. The living quarters contain 107 rooms, 40 corridors, and 19 baths. The White House contains a doctor’s suite, a dentist’s office, a large solarium, a broadcasting room, and a two-floor basement for storage and service rooms. The office in which the president works is not located in the White House, but in a separate building called the West Wing. The White House stands on 16 acres of parklike land and overlooks a broad lawn, flower gardens, and wood groves.

The word “contest” is closest in meaning to _____.