- FUTURES
The warfighter
![Brains stack up like Matryoshka dolls one inside another with the largest brain having a rifle-style target on it](https://cdn.statically.io/img/media.nature.com/w767/magazine-assets/d41586-024-00821-2/d41586-024-00821-2_26875820.jpg)
Illustration: Jacey
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doi: https://doi.org/10.1038/d41586-024-00821-2