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Mixing Covid jabs has good immune response, study finds

A mix-and-match approach to Covid vaccines - using different brands for first and second doses - appears to give good protection against the pandemic virus, a UK study has found. The Com-Cov trial looked at the efficacy of either two doses...

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NASA Mars Helicopter Fails to Respond for 4th Flight

The U.S. space agency NASA said the experimental Mars helicopter Ingenuity, after three successful flights, failed to respond to commands to lift off for a fourth flight Thursday. Scientists with the Ingenuity team at NASA’s Jet Propulsion Laboratory (JPL) in...

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