Anne Frank and the ballpoint pen. Let's debunk it.
"Trying to invent a pen that could write on leather, a tanner, John J. Loud, invented the first ballpoint pen and patented it in 1888 in America"
http://www.historyofpencils.com/writing-instruments-history/history-of-ballpoint-pens/
"Trying to invent a pen that could write on leather, a tanner, John J. Loud, invented the first ballpoint pen and patented it in 1888 in America"
http://www.historyofpencils.com/writing-instruments-history/history-of-ballpoint-pens/
Comments
"The first working ballpoint pen was presented at Budapest International Fair in 1931"
So yes, Anne could very well have used the pen.
However, it was only used at a later date.
https://www.hdot.org/debunking-denial/af3-ballpoint-pen/
"The earliest surviving fountain pens date to the early 18th (or possibly later 17th) century"
https://www.vintagepens.com/FAQhistory/who_invented_fountain_pen.shtml