Sunday, December 27, 2020

¿Cuánta inmunidad de rebaño es necesaria?


By BY DONALD G. MCNEIL JR. from NYT en Español https://ift.tt/2MdG1Qf

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Mystery interstellar object could be oldest known comet

Scientists have been racing to discover the origins of 3I/Atlas since it was spotted last week. from BBC News https://ift.tt/xewK3AI