Build your vocabulary! We add new words for each issue.
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Space Junk:
Chris Butler/
Photo Researchers, Inc.
Lemur: Mark Thiessen
Cave: © Urosr/
Shutterstock
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Space Junk
Will a piece of cosmic clutter crash into the next space mission?
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What's New?
Travel with scientists as they journey through jungles and over tall mountains searching for animals unknown to science. The adventure begins on page 2 of our May 2010 issue.
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Caves
Head deep below Earth's surface to a world of shadows, tunnels, and raging rivers. Explore Earth's caves on page 16 of our May 2010 issue.
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