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Rochelle Walensky, Joe Biden’s pick for the next head of the Centers for Disease Control and Prevention, has emphasized the need for science-based decision-making in the pandemic.
Cosmologists suggest that an exotic substance called quintessence could be accelerating the Universe’s expansion — but the evidence is still tentative.
Canines seem to detect coronavirus infections with remarkable accuracy, but researchers say large-scale studies are needed before the approach is scaled up.