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Why are only 151 cases of Covid-19 sufficient to demonstrate that Moderna's vaccine is 60% effective in a trial with 30,000 participants?

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Why are only 151 cases of Covid-19 sufficient to demonstrate that Moderna's vaccine is 60% effective in a trial with 30,000 participants?	1044
What makes the piles of gray sand on the ocean floor on the Pacific coast of Oaxaca, Mexico?	1