In World War II, the Russians thought the wide Bug River would protect them from the German army. But the Germans had an ace up their sleeve. They had invented an underwater tank! The Russians were surprised when 80 tanks came out of the river. What do the underlined words mean?

In the mid-1960's, young men in college could not be forced to join the military. Still, many of them protested the Vietnam War. In 1968, that law was changed, and college students were drafted. This added fuel to the fire, and demonstrations against the war increased. What do the underlined words mean?

In 1886, Josephine Cochrane was tired of servants breaking her dishes. So she built a dishwasher by placing racks on a wheel inside a large tub. As the motor turned the wheel, hot, soapy water sprayed the dishes. Humming happily as it worked, Cochrane's invention never broke a dish. What is the dishwasher being compared to in the underlined words?

When Meg Conkey stumbled upon a cave in France in 1994, she was in for a surprise. The walls of the cave were covered with drawings of animals and human handprints. The drawings were created over 32,000 years ago. What do the underlined words mean?

Amelia Earhart was the first woman to fly across America. And she was the first woman to fly across an ocean. In 1937, she tried to be the first woman to fly around the world. But this trip spelled disaster. Earhart's plane crashed and she was never found. What do the underlined words mean?

Before 1974, girls weren't allowed to play Little League baseball because people thought baseball was a boy's game. But that year, the rules changed and now girls and boys can play. Since 1974, 10 girls have competed in the Little League World Series. I guess baseball isn't just for boys, is it? What do the underlined words mean?

During his childhood, Ben Carson fought with other kids and once was even in a knife fight. His mom became concerned and wanted him to turn his life around. She made him read two books a week, and suddenly Ben stopped fighting and started learning. Today he is a famous doctor. What do the underlined words mean?

During an ice age, the weather becomes very cold, and much of the world is covered with ice. The animals that lived during the last deep freeze are now extinct. But scientists have learned about them from fossils and cave drawings. What are the underlined words referring to?

Chinese kings once used bones to predict the future. A king would say two things like, "We will win the war," and, "We will lose the war." Next, he would heat a bone, causing the bone to crack, and then read the cracks to find out which would come true. What does the underlined word mean?