I am sorry for off-topic, I am considering about making an enlightening web site for pupils. Will probably commence with publishing interesting facts such as"No piece of square dry paper can be folded in half more than 7 times"Please let me know if  you know where I can find some related facts like here
 
http://thesuccour.com/2016/08/06/the-transformation-of-on-line-producing-products-6/