Day 6 human embryos shown as neon cells on a black background. The right-hand embryo has magenta and yellow cells; the left-hand, magenta, yellow and cyan

‘Edited’ human embryos reveal secrets of our development — and fuel ethical debate

Ethical discussions are urgently needed as genome-editing science advances, some researchers say.

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Photochemical reaction in glass vial.

Chemistry

Chemistry research is undergoing a period of transformation, driven by new technologies and mounting environmental pressures.
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