# Start with context: priors and Bayes

Follow Zon and Coach from a hypothetical alarm-and-test example to counting positive signals, then update beliefs about a simulated coin.

Nine interactive stages include paced dialogue, readable transcripts, prediction experiments, thinking questions and hints. One Bayes permission includes this lesson and its audio.

Canonical page: https://21ifm.com/ai/priors-bayes

## Explore

- [Entropy and cross-entropy](https://21ifm.com/ai/entropy)
- [KL divergence](https://21ifm.com/ai/kl-divergence)
- [Priors in the VAE](https://21ifm.com/ai/variational-autoencoder)