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The characteristic hammer-shaped head is just becoming visible in this image of an embryonic bonnethead shark. Scale bar = 1 cm. Steven Byrum and Gareth Fraser, Department of Biology, University of Florida

Rare access to hammerhead shark embryos reveals secrets of its unique head development

Because hammerhead sharks give birth to live young, studying their embryonic development is much more complicated than harvesting some eggs and watching them develop in real time.
One of the earliest depictions of flying witches is in a 15th-century text entitled “Le champion des dames,” or “The Defender of Ladies.” Martin Le Franc/W. Schild. Die Maleficia der Hexenleut' via Wikimedia Commons

Can witches fly? A historian unpacks the medieval invention − and skepticism − of the witch on a broomstick

The iconic image of a witch on a broomstick has apocryphal origins. But whether they could actually fly didn’t stop Christian society from persecuting them.

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