The last decade was the hottest on record, and its consequences go far beyond melting glaciers. Climate change is disrupting ecosystems, threatening food security, and putting human health at risk. To address these complex challenges, scientists need research tools that are not only robust and predictive but also ethical and scalable. That’s where New Approach Methodologies (NAMs) such as zebrafish eggs come into play, offering powerful insights into how a warming world impacts life at every scale. But how can something as small as a fish egg help us tackle…