It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
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What makes this particularly significant is Google's market position. Despite the rise of alternative AI search tools, Google still processes billions of searches daily and serves as the primary discovery mechanism for most internet users. When Google integrates AI-generated answers into its core search experience, it's not experimenting with a niche feature—it's fundamentally changing how the world's most popular search engine works.