General:
http://www.history.com/news/history-lists/11-innovations-that-changed-history
http://bigthink.com/paul-ratner/top-20-greatest-inventions-of-all-time
https://www.nationalgeographic.com/magazine/2017/06/explore-top-ten-innovations/

The Compass:
https://www.thoughtco.com/compass-and-other-magnetic-innovations-1991466

Gunpowder:
https://www.thoughtco.com/gunpowder-facts-and-history-607754
https://historyofgunpowder01.weebly.com/timeline.html
http://classroom.synonym.com/timeline-invention-gunpowder-12743.html

Steam Engine:
https://www.thomasnet.com/articles/custom-manufacturing-fabricating/steam-engine-history/

Contraceptives:
http://time.com/3692001/birth-control-history-djerassi/

Light Bulb:
https://www.bulbs.com/learning/history.aspx

The Refrigerator:
https://www.livescience.com/57797-refrigerator-history.html
http://www.keepitcool.com/history_of_the_refrigerator2.htm

Penicillin:
https://microbiologysociety.org/education-outreach/antibiotics-unearthed/antibiotics-and-antibiotic-resistance/the-history-of-antibiotics.html

The Telegraph:
http://www.history.com/topics/inventions/telegraph

The Internet:
https://www.livescience.com/20727-internet-history.html
http://www.history.com/topics/inventions/invention-of-the-internet