Discusses how scientists and explorers throughout history uncovered various facts about the size, composition, geography, and place in space of the planet Earth.
Presents a history of America's pledge to the flag, notes how it has changed, and explains its meaning, with attention given to the addition of the phrase, "under God."
From surgery to vaccines, man has made great strides in the field of medicine. Quality of life has improved dramatically in the last few decades alone, and the future is bright. But students must not
