Inventions that made millions

https://www.lolwot.com/20-ridiculously-simple-ideas-that-made-millions/

https://www.thoughtco.com/weird-inventions-4150072

https://www.geniusstuff.com/blogs/10-weird-inventions-millions10.htm

http://www.lifebuzz.com/weird-inventions/5/

https://www.entrepreneur.com/article/227358

https://en.wikipedia.org/wiki/Pet_Rock

https://www.washingtonpost.com/business/gary-dahl-inventor-of-1970s-fad-the-pet-rock-dies-at-78/2015/04/02/f52c6750-d88f-11e4-8103-fa84725dbf9d_story.html?noredirect=on&utm_term=.f0a009f6353f
http://www.toyhalloffame.org/toys/slinky

https://www.adweek.com/brand-marketing/twisted-tale-slinky-most-popular-toy-ever-167300/

https://thehustle.co/million-dollar-homepage-alex-tew

https://www.wired.com/2008/12/iphone-fart-app/

http://blog.apollomusicstore.com/meet-the-guy-who-made-a-fortune-with-a-fart-app/

https://en.wikipedia.org/wiki/Magic_8-Ball

http://content.time.com/time/specials/packages/article/0,28804,2049243_2048651_2049037,00.html

https://thehustle.co/big-mouth-billy-bass-story

https://wonderopolis.org/wonder/who-invented-the-hula-hoop

http://time.com/money/4765380/fidget-spinners-inventor-catherine-hettinger-profits/