Recovering the CMB History

• Saha and equilibrium ionization
• recombination history
  CMB spectra distortion from line emission: in context
• last scattering
• freeze-in of residual ionization
• gas decoupling

Primordial Nucleosynthesis

Warmup: Particle Zoology

• antimatter
• baryons
• nuclear physics FAQ
  
  • nuclei, charted
  • nuclear forces
  • nuclear binding energies