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https://www.csmonitor.com/Technology/2012/1005/The-20-most-fascinating-accidental-inventions/Slinky
http://www.businessinsider.com/these-10-inventions-were-made-by-mistake-2010-11#x-rays-15
https://www.healio.com/endocrinology/news/print/endocrine-today/%7B15afd2a1-2084-4ca6-a4e6-7185f5c4cfb0%7D/penicillin-an-accidental-discovery-changed-the-course-of-medicine
https://en.wikipedia.org/wiki/Wilhelm_R%C3%B6ntgen
http://time.com/3649842/x-ray/
https://science.howstuffworks.com/innovation/scientific-experiments/9-things-invented-or-discovered-by-accident5.htm
https://www.independent.co.uk/news/obituaries/wilson-greatbatch-inventor-of-the-implantable-cardiac-pacemaker-2363206.html
https://gizmodo.com/5844558/wilson-greatbatch-the-man-who-accidentally-invented-the-pacemaker-has-died
http://www.businessinsider.com/how-the-microwave-oven-was-invented-by-accident-2015-4
https://science.howstuffworks.com/innovation/scientific-experiments/9-things-invented-or-discovered-by-accident7.htm
https://en.wikipedia.org/wiki/Inkjet_printing
https://science.howstuffworks.com/innovation/scientific-experiments/9-things-invented-or-discovered-by-accident4.htm