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Listening to Tangents is like making an investment with your brain. And the dividend? Knowledge. Invest today, won't you? Follow us on Twitter @SciShowTangents, where we’ll tweet out topics for upcoming episodes and you can ask the science couch questions!    If you want to learn more about any of our main topics, check out these links:   [Truth or Fail]   Supernotes https://www.nytimes.com/2006/07/23/magazine/23counterfeit.html https://www.uscurrency.gov/history   Counterfeit $1 bills https://www.nydailynews.com/news/crime/finding-mr-880-case-1-counterfeit-article-1.109016 https://www.nysun.com/on-the-town/little-old-moneymaker/9282/ pictures: https://thehustle.co/worst-counterfeiter-in-history-mr-880/ https://www.secretservice.gov/about/history/events/   Costume jewelry scam https://books.google.com/books?id=ELgiAAAAMAAJ&pg=PA85&lpg=PA85 https://o.canada.com/technology/nigerian-email-scams-royally-obvious-for-good-reason-study-says-3   [Fact Off]   Xerox machine anti-counterfeiting https://www.mentalfloss.com/article/67833/counterfeit-chocolate-not-just-thing-past https://www.bbc.com/future/article/20170607-why-printers-add-secret-tracking-dots https://www.bbc.com/future/article/20150624-the-secret-codes-of-british-banknotes https://murdoch.is/projects/currency/   Yap stone money https://www.npr.org/sections/money/2011/02/15/131934618/the-island-of-stone-money http://www.bbc.com/travel/story/20180502-the-tiny-island-with-human-sized-money https://www.sciencealert.com/the-original-bitcoin-still-exists-as-giant-stone-money-on-a-tiny-pacific-island https://www.sciencenews.org/article/yap-stone-money-bitcoin-blockchain-cryptocurrency   [Ask the Science Couch]   Plastic vs. paper bills https://www.banknoteworld.com/blog/the-pros-and-cons-of-polymer-banknotes/ https://www.euronews.com/2018/05/16/polymer-vs-paper-banknotes-which-one-is-better-for-environment- https://www.forbes.com/sites/davekeating/2019/08/21/englands-new-currency-is-harming-the-climate-report/#543d2d76524f https://www.moneyboat.co.uk/blog/paper-vs-polymer/ https://www.bankofengland.co.uk/-/media/boe/files/banknotes/polymer/lca-of-paper-and-polymer-bank-notes.pdf?la=en&hash=7D3845CE11AD21F300CFA023F8FCF4AA37FB73CC    Composting or washing U.S. money https://www.cnet.com/news/cash-to-trash-watch-millions-of-dollars-turn-into-compost/ https://www.acs.org/content/acs/en/pressroom/presspacs/2014/acs-presspac-january-8-2014/laundering-money-literally-could-save-billions-of-dollars.html   [Butt One More Thing]   Penny swallowing https://www.chicagotribune.com/news/ct-xpm-1998-12-01-9812010102-story.html https://www.sciencedaily.com/releases/1998/12/981201033841.htm