Résultats de "Kathiann Kowalski" dans Toutes les catégories

How much do you know about that three-pound hunk of tissue in your head - your brain? Its structure and function drive your behavior in profound ways. Scientists are studying the brain and its chemicals to find behavioral patterns, to figure out the sources of good moods and random outbursts, for example. This compilation from Science News for Students turns to brain science to answer all sorts of questions: Can you actually be addicted to your phone? Why is it so hard to sleep away from home?

What is the judicial branch? It's the part of government that's in charge of our courts. But just what do the courts do? And how do they affect your daily life? Listen to this audiobook to find out.

What are checks and balances? They are limits that keep different parts of government from having too much power. But just what are these limits? And how do they help our government run more smoothly? Listen to this audiobook to find out.

There's a job available to all natural-born American citizens aged 35 and older: the President! From campaigning to conventions, voting and the Electoral College, it's a long way to the Oval Office! U.S. presidents have a lot of work ahead of them, such as preserving the Constitution and making sure the laws of the land are obeyed.

Each year, more than 250 hikers need assistance at the Grand Canyon. If you plan ahead and use safety smarts, you can avoid becoming number 251! And you can have a great hiking adventure.

Magazine articles don't just magically appear on the page. Good writers grab your attention. Then they keep you reading.

"All the world's a stage," William Shakespeare wrote. More than 400 years later, stages around the world still show Shakespeare's plays. But who was William Shakespeare? And what makes his plays so great?

Cars, wagons, and other vehicles aren't the only places you'll find wheels . . . Be on the lookout for these and other working wheels.

It takes commitment to overcome interests that stand in the way of protecting the environment. Meet three people who weren't afraid to speak up to protect natural areas—and us.

Here's how a few pioneers forged their own unique paths in the conservation movement.

Did you know if you break a bone, the bone can repair itself? You'll need to visit the doctor to have your broken bone set in a cast, while your body is hard at work repairing the injury! The moment you fall, blood from your injury sends signals to cells to start building new bone–the process of repairing is on its way! Do you know what your body makes to create new bone?

Do you know how the lightbulb was invented? In the 1800s, the first incandescent lightbulb was invented by Thomas Edison. Learn how Edison experimented with different materials, direct current, and by trial and error to design the first lightbulb. Which power company was created that funded the first electric lighting system to distribute light? The company still operates today, lighting and powering our world!

Have you ever had an electrical power outage at home? In 2003, the largest blackout in United States history left millions of people without power for days! Learn how power generation plants are connected to the power grid that distributes electricity to regions of the country and to homes. What causes power outages? How does losing power affect daily life? What can people do to conserve energy?

Tensions continue to rise between the Soviet Union and the United States as they engage in a Cold War. One of these battles was the space race. Learn how both countries began engineering and scientific effort to be the first to travel into space and back to Earth and the technology necessary to operate in it. See how scientists fight for peace as they begin their efforts to explore the unknown.