As the United States deals with COVID-19, some people work or go to school at home. Other people, though, are essential workers. They have to go to work because they take care of important services. … Read more
Lasers use mirrors to concentrate light energy into a thin, powerful beam. You might be surprised by how often people use lasers. In fact, you may have a laser at home. A DVD player uses a laser to … Read more
A Dangerous Gas Nitrogen dioxide (NO2) is a gas that is released into the air when fuel is burned. Emissions from cars, trucks, buses, power plants, and other industrial facilities release nitrogen dioxide. The environmental impact of nitrogen dioxide includes smog and acid rain. … Read more
Have you been meeting with your class online? If so, you are not alone. Even the justices of the Supreme Court of the United States are hearing their cases remotely—over the phone. Usually, the justices … Read more
A census is required by the United States Constitution. The first census was conducted in 1790, and they have taken place every ten years since then. Everyone over the age of 18 who lives in … Read more
You have probably heard the words “social distancing” in the news. Social distancing is a way to stop the spread of COVID-19, the new coronavirus. Scientists believe that the virus spreads through the air when … Read more
The photograph shows Leon Georget, a cyclist who won many races in the early 1900s. His bike doesn’t look too different from bicycles today. But Georget is missing an important piece of safety equipment—a helmet! … Read more
How are you celebrating Earth Day this month? You might be doing things to help fight climate change, like recycling or planting a tree. But what exactly is climate change, and why is it happening? … Read more
The countdown to Earth Day 2020 has begun! This year’s main theme will focus on climate action. Climate change represents a major issue that impacts life on Earth. It involves changes in weather patterns, and … Read more
Earth Day is celebrated every year in April. This year, many people are staying away from big crowds to avoid spreading a virus. That means that Earth Day celebrations might be postponed until it is … Read more
© 2024 McGraw-Hill Education. All Rights Reserved.
