Katharine tells Lorien about the worst thing you can get in the mail.
Sources:
https://www.cdc.gov/anthrax/basics/index.html
https://en.wikipedia.org/wiki/2001_anthrax_attacks
https://www.fbi.gov/history/famous-cases/amerithrax-or-anthrax-investigation
https://www.propublica.org/article/new-evidence-disputes-case-against-bruce-e-ivins
