At sea, captains need to know their ships' location at all times or risk crashing into unseen dangers. Since people first took to the seas, the stars have been useful for measuring latitude-or position relative to north and south. But up until the 18th century, there was no accurate way to measure longitude-or position relative to east and west. Countless seamen were lost because they didn't know they had sailed into dangerous waters. To encourage the invention of an accurate method for measuring longitude, the British monarchy offered the Longitude Prize in 1714. Major scientists of the age-notably Galileo and Sir Isaac Newton-were convinced the only possible solution was mapping the heavens. But John Harrison, a clockmaker from a tiny village, thought differently. He was sure the answer was simply a matter of time. Over many years, he built a seafaring clock entirely from scratch. His design worked brilliantly, yet politics conspired to keep him from the prize he so rightly deserved. This fascinating book from Kathryn Lasky will interest children in science, math, and history through an accessible biography of a great innovator.
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Jack and Annie are on a mission to save Merlin from his sorrows! The brother-and-sister team travel back in the mag...
"Two years ago bulldozers had come to make a cut at the top of Sarah's Mountain. They began uprooting trees and pushing subsoil in a huge pile to get at the coal. As the pile grew enormous, so had M.C.'s fear of it. He had nightmares in which the he...
Tao is an outcast. Unlike the great hunters of his clan, Tao does not want to kill the wild bears or woolly mammoths of the hunt. Instead he wants only to paint them. But only Chosen Ones can be cave painters. What's more, Volt, the clan leader, vio...
It is 1804-a historic year in America-the year that Meriwether Lewis, William Clark, and the Corps of Discovery set out for their now-legendary exploration of the Louisiana Purchase, departing St. Louis to travel across the country to the Pacific Oc...
In 1767, 11-year-old Nicholas Young stowed away on Captain James Cook's "Endeavour." Cook's three-year mission was secret: he was charged by the British Navy to search for a lost continent, believed to be located between the southern tip ...
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Jack and Annie travel back in time to a desert in the Middle East. There they meet a Bedouin tribe and learn about ...
Jesse, a Hebrew slave, and Jennat, a half-Egyptian, half-Syrian servant girl, both serve the Egyptians, but they live in vastly different worlds. Though Jennat serves a wealthy mistress, Memnet, she is content to share in the glitter of Egyptian lif...
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! The Ice Age is very cool…for two kids in bathing suits! Jack and Annie nearly freeze when the Magic Tree Hou...
Poland, 1940. The Russian army invades the beautiful city streets of Vilna. Soldiers storm ten-year-old Esther Rudomin's house and arrest her entire family. The Rudomins, the soldiers say, are "capitalists-enemies of the people." Forced from their h...
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