Several properties of agar render it a superior jelly. Agar isn’t broken down by microbial enzymes apart from a few species (including bacteria living in marine and freshwater habitats), and it dissolves well in boiling water, making it easy to sterilize. The jelly doesn’t react with the ingredients of a broth, whose composition can be adjusted to meet the nutritional requirements of different microbes, and sets to a firm gel without the need for refrigeration.
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00573-1
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This essay walks through the full build: why voice agents are deceptively hard, how the turn-taking loop works, how I wired together STT, LLM, and TTS into a streaming pipeline, and how geography and model selection made the biggest difference. Along the way, you can listen to audio demos and play with interactive diagrams of the architecture.
This complex engineering translates into tangible benefits: