Explorers only reached the North Pole and the South Pole in the 1900s. They risked chilling cold, blinding blizzards, and frostbite to investigate these frozen zones.

Crazy Horse grew up riding horses and hunting buffalo. But it was his bravery and daring in battle that earned him the name Crazy Horse. This was also his father’s name.
Crazy Horse was one of the greatest Native American chiefs. When the United States government tried to force Native Americans to live on reservations, Crazy Horse fiercely defended his people’s land and way of life.

BALLET Raise your arms and bring your fingers together over your head. Now lift one foot, point your toes, and strike a pose. You are doing ballet. Ballet is a form of dance with graceful steps and arm movements as well as leaps and spins. We also use the word ballet...

VACCINATION “You’ll just feel a little jab.” Ouch! That wasn’t too bad, and it could save your life. Most of us have had “shots” from a needle. These are usually vaccinations, and they are extremely valuable. They help protect us against diseases. VIRUSES Most...

LOBSTERS Can you grow a new body when you get too big for your old one? Of course not. But lobsters can. They keep growing their whole life. As a lobster grows, it often molts. This means that it grows a new shell and casts off its old one. It even regrows any legs or...

GREAT WALL OF CHINA Imagine a huge wall stretching for thousands of miles across the land. The wall winds through hills, climbs mountains, and crosses deserts. If you visit China you can see a wall like this. The Great Wall of China, as it is known, is the longest...

PAUL REVERE On April 18, 1775, in the dark of night, Paul Revere awoke to pounding on his door. Friends brought news: British troops were on the move! Revere pulled on his clothes and jumped on a borrowed horse. Along with two other horsemen, he galloped from his home...

People exercise to keep healthy. They exercise to lose weight or to stay fit. They exercise to make their muscles bigger and stronger. Maybe you play soccer or some other sport for exercise. Getting exercise can be fun and can make you feel good.
Exercise is a big part of staying physically fit. People who are physically fit are alert and full of energy. Exercise can also help people handle stress. Exercise is especially good for children, teens, and older persons.

Imagine how frightened prehistoric people must have been when they saw a black disk covering up the Sun. This darkening of the Sun in the middle of the day is called an eclipse. The Moon can go dark in a similar way at night. Eclipses are caused by shadows.