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Science Panorama
The Time-Travel Paradoxes
What happens if a time traveler kills his or her grandfather? How do you stop a time machine from just appearing somewhere in space, millions of kilometers from home?
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Girls Choose Science
The First Woman in Space
53 years since the Valentina Tereshkova's historical flight, the only woman to ever fly alone in space
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Science Panorama
The Long and Winding Road to Mars
What technologies are still required for colonization of the red planet?
