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Quanta Magazine on Twitter: "Physicists are narrowing down the list of cosmic accelerators that can produce the shockwaves that might accelerate cosmic rays to ultra-high energy levels. https://t.co/RqkwWn6Sco https://t.co/dAuUGFCj6f" / Twitter
ESPN Official Size 18mm 2 Piece Table Tennis Table with Table Cover, #1 Indoor Model 298.97 + Free Shipping
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