Middle Ages
Chivalry
- Mark Cartwright. Medieval chivalry. World history encyclopedia, 14 May 2018.
Feudal and manorial systems
- Serfs and manorialism. Khan Academy, 2012.
Doomsday Book
- Domesday: Britain's finest treasure. The National Archives.
- The Domesday Book online.
Marriage
Polygamy
- Jane Treays. One man, six wives and twenty-nine children. 1999. 49:58.
Same-sex marriage
- David Crary, Mike Corder. The Dutch went first in 2001: who has same-sex marriage now? 1 April 2021.
Creativity
Rube Goldberg machine
- Cartoon gallery. The Rube Goldberg Institute for Innovation and Creativity.
- Los inventos del TBO. La arquitectura del objeto. 24 sept. 2013.
- David Morgan. The wacky inventions of Rube Goldberg. CBS news. 26 Jan. 2014.
- Nickolaus Hines. Ten brilliant Rube Goldberg machines that are endlessly fun to watch. Cool material. 10 Oct. 2022.
Writer's block
- Maliha Mannan. Five common reasons behind writer's block (and ways to beat it). The side blogger. 25 Oct. 2022.
- Gloom. Writer's block: causes, symptoms, and cures (overcoming it). Mental health daily. 4 Oct. 2014.
- The psychology of writer's block (and how to overcome it). Open Colleges, 16 Mar. 2018.
Creativity techniques
- Sixteen techniques for creativity. Indeed. 11 March 2023.
- The ultimate list of visual creative thinking techniques for your next great idea. Creately. 10 January 2023.
- Richard St. John. Four simple ways to have a great idea. TED Archive, 2016. 4.58.
- How to develop a creative mind? Six hacks for creative thinking. Skillopedia, 2022. 6:12.