Lyrid meteor shower to peak on Earth Day

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Giant shipworm the size of a baseball bat found alive for first time

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California desert comes alive with wildflower 'superbloom'

Bizarre new species of crab lives entirely in trees

8 iconic plants and trees that herald spring

Are these massive tunnels in South America the work of giant sloths?

Drink in the hue of a Texas bluebonnet bloom

World's largest dinosaur footprint shows just how enormous these beasts were

Cherry blossoms paint nation's capital pink

9 famous mirages that play tricks on the eyes