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Why Insects Aren't Huge: a New Challenge to a Decades-Old Idea

Researchers found tracheoles occupy less than 1% of flight muscle volume, suggesting oxygen diffusion did not limit insect size; other factors like exoskeleton mechanics and predation likely played a role.

Summary by Nature
Nature, Published online: 25 March 2026; doi:10.1038/d41586-026-00976-0Evidence suggests oxygen levels may not have been limiting factor — plus, CRISPR gives cancer-fighting immune cells an upgrade.

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Nature broke the news in United Kingdom on Wednesday, March 25, 2026.
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