In the Know
What Can Lasers Do?
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
Month: May 2020
In the News
Travel Restrictions Help Reduce Air Pollution
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
In the News
Supreme Court Hears Cases Remotely
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
In the Know
The Census and Representation
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
In the News
The Importance of Social Distancing
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
In the Know
The History of the Bicycle Helmet
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