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Science History
The Mathematician Who Defied Concentration Camps
Felix Hausdorff, a leading mathematician of the 20th century, chose to end his life instead of being sent to a concentration camp at the age of 73
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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?
