Sort of OT but interesting

[Guest guest]

I was just helping my granddaughter with her HW in Social Studies. They

studying medeival times. One of the topics that were mentioned was the

plague. Who ever wrote this book was misinformed. They commented that

the plague ended from sanitation and vaccines. Umm... I didn't know

they had vaccines in A.D. 1350. In fact I didn't know that a vaccine

for the plague was ever developed, or used.