Most people use just a fraction of the words they understand. But how big is your vocabulary, really? When a fan built a tool that claims to measure it, Hannah and Michael put themselves to the test. If you'd like to try for yourself, follow the link and tell us what score you get in the comments: https://vocabowl-870366514258.us-west1.run.app/ Along the way they uncover forgotten words, obscure linguistic curiosities, and a surprising question hiding beneath the quiz itself: what does it mean to know a word? After the break, they tackle your questions and answer a nuclear pizza problem, explain why humans can grow such remarkably long hair, and ask whether everyone has a voice inside their head. ------------------- For more information about Cancer Research UK, their research, breakthroughs and how you can support them, visit ⁠⁠https://www.cancerresearchuk.org/our-research/rest-is-science Cancer Research UK is a registered charity in England and Wales (1089464), Scotland (SC041666), the Isle of Man (1103) and Jersey (247). A company limited by guarantee. Registered company in England and Wales (4325234) and the Isle of Man (5713F). Registered address: 2 Redman Place, London, E20 1JQ. ------------------- Video Editor: Adam Thornton Animator: Sam Benson Video & Social: Bex Tyrrell Assistant Producer: Lucy Lipscombe Producer: Simona Rata Senior Producer: Lauren Armstrong-Carter Head Of Digital: Samuel Oakley Exec Producer: Neil Fearn ------------------- 00:00 Intro 00:20 Michael and Hannah play VocabOwl 01:38 Cancer Research UK 02:55 Who won VocabOwl, Hannah or Michael? 20:23 Cancer fighting bugs 25:00 If you stand at the perfect distance from a nuclear blast, is it true you get a perfectly microwaved pizza? 28:08 Why do humans need haircuts, but monkeys and apes don’t? 32:38 Why do we talk to ourselves? 48:13 Outro