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Why The Universe Probably Isn’t Shaped Like A Donut

Despite the recent headlines, it's an extraordinarily unlikely proposition.

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18 hours ago

Russia’s New Stealth Fighter Might Be A High-Flier

Russia’s new stealth fighter has a really big wing. That might mean one or both of two things. It could be that Sukhoi, the company behind the new “Checkmate” fighter, is aiming eventually to sell Checkmate to the Russian navy for operations from the fleet’s sole aircraft carrier.