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John Glenn: First American to Orbit the Earth

In February 1962--just nine months after President John F. Kennedy called for the U.S. to put a man on the moon before 1970--Mercury astronaut John Glenn became the first American to orbit the Earth.
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Sacagawea: Assisted the Lewis and Clark Expedition

Details of her life remain sketchy, and the time and place of her death are still debated, but the young Indian woman who assisted Meriwether Lewis and William Clark on their great journey west has a secure place in history.
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The Corps of Discovery: After the Expedition

Its mission over, the Corps of Discovery disbanded and its members sought their own destinies. Some of them passed from the historical record, but others had adventures that made their experiences with Lewis and Clark seem almost tame by comparison.
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Klondike Gold Rush

Known as 'Lying George' for his many false strikes, George Washington Carmack and two Indian friends found a real nugget in 1896 that set off a fabled gold rush in Canada.
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Edmund Halley: Scientific Giant

Edmund Halley, best known for his 17th century prediction of the 76-year frequency of the cosmos' most famous comet, made scientific contributions far beyond astronomy.