text: Gift Ideas:
  
  Want a higher-level treatment of the universe?
  
  Based on a Princeton course — it’s big. Its got math. Yet it’s friendly.
  
  WELCOME TO THE UNIVERSE: An Astrophysical Tour
  https://t.co/1I5W3eYH6o
  
  Prefer the brief, pocket-sized, no-math version?
  
  https://t.co/SpVtzI8Ezb https://t.co/PMUvX2LMcu