3 D Printing
3D printing long ago moved from being theoretical to a reality, and in recent years 3D printers have become cheaper to produce; several models are now available for sale, as well as designs for pro...
Shipwrecks are as old as seafaring humans.
Exploration And Explorers
While past explorers like Christopher Columbus have name recognition, pl...
Mountains can form from colliding tectonic plates and volcanic activity.
Lakes can vary greatly in size, from small ones to the Great Lakes.
Research In Action
Images reveal the amazing world of science.
Rivers erode the land and carry sediment into the ocean.
There are 59 national parks in the United States.
Glaciers are giant rivers of ice.
Coral reefs support entire ecosystems of animals.
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