How stickers are made in factories (using a printing press.) Nowadays, almost anybody can print on sticker paper using a regular printer.
I printed a few photos before but instead of using photo paper, I used sticker paper.
Highlighter Pens I honestly did not know that chemists are needed in making highlighter pens. Haha. Learned something new.
Also, I googled highlighter and the top search resolute was about makeup I never knew existed.