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Four takeaways on "unstoppable" ice melt
White House report sounds climate alarm
Unemployment rate plunges during April
How space is changing life on Earth
Pulse: Americans foresee high-tech world
4 tech changes that could make things worse
A primer: Earth's 'cousin' orbits distant star
Deadline to vote on new spacesuit design
An anniversary that is about more than taxes
Upcoming lunar eclipse worth a sleepless night
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