TIL that during the 2001 anthrax attacks, one of the biggest concerns of investigators, was ensuring that smallpox samples had not been placed in with the anthrax.

https://en.wikipedia.org/wiki/2001_anthrax_attacks#Anthrax_material
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ge8015/til_that_during_the_2001_anthrax_attacks_one_of/