“My Geography teacher died yesterday. Well, he is History now”

There’s a difference between being a History teacher and being history. “That English teacher they sent up (into space and died—ed.)?  She is history now” was posted on Twitter on June 3, 2014. “Did you hear about the math teacher who was in the plane crash? She’s history now” was posted on Twitter on September 3, 2015.
     
“My Geography teacher died yesterday. Well, he is History now” was posted on Reddit—Jokes on January 8, 2018.
   
       
Twitter
Dolph Pun‏
@DolphPun
That English teacher they sent up?  She is history now.
(what color were her eyes?  Blew.  One blew that way,... http://fb.me/17ljKUm0B
1:13 AM - 3 Jun 2014
 
Twitter
Heck 🏳️‍🌈‏
@hello__itsjess
Did you hear about the math teacher who was in the plane crash? She’s history now.
12:41 AM - 3 Sep 2015
     
Reddit—Jokes
My Geography teacher died yesterday.
submitted January 8, 2018 by Database3000
Well, he is History now.
 
Twitter
Living Sarcasm‏
@SarcasmLiving
My Geography teacher died yesterday.
Well, he is History now.
7:32 AM - 8 Jan 2018