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Flight attendants' and teachers' unions whose members are on the front lines of disputed covid safety protocols are ardent enforcers of mask mandates for the public but do not require their members to get vaccinated. Such inoculation is widely acknowledged as the most effective measure in stopping the spread of the highly infectious new Delta variant, while masking is viewed as of secondary importance and many are highly skeptical of its effectiveness and critical of its inconvenience.

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A new analysis of hatchling pterosaur fossils finds that the flying reptiles which dominated the skies between 228 and 66 million years ago were likely capable of flight within days or even hours after breaking out of their shells.

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