Genes & Cells

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germline editing

ROOTS  Scientists are mulling the ethical implications human germline editing — tinkering with reproductive cells and embryonic tissues like this zygote — while pushing technical boundaries that could make genetically engineered people possible. 

seafloor map

VISITING THE RELATIVES  At a deep spot (red dot) on the seafloor between Norway and Greenland not far from the hydrothermal vents at Loki’s Castle, mud has yielded DNA samples from microbes that may be the closest kin yet known to complex life.

stretchy nerves in a whale

WIDE OPEN  Fin whales and others like them have stretchy nerves (yellow) in their mouths and tongues that help the whales open their mouths wide to swallow a lot of prey.

Genes & Cells

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