As a first test run, I'd send my book back to 2014, man that'd save me so much work. Next, I'd send a piece of paper back to the year 1100 that just says:
"Polish a concave mirror and a small lense like so:
<drawing> and point the contraption to Saturn. Cool eh? Now that I have your attention: WASH YOUR HANDS BEFORE TOUCHING ANYONE, DISEASE MOSTLY COMES FROM TINY ANIMALCULES.
"Polish a concave mirror and a small lense like so:
<drawing> and point the contraption to Saturn. Cool eh? Now that I have your attention: WASH YOUR HANDS BEFORE TOUCHING ANYONE, DISEASE MOSTLY COMES FROM TINY ANIMALCULES.
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition
