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"You know gold, mom?
"Yes, sure"
"It's like gold but you can't see it"
"Go to your room!"

that's funny and true i guess

And here is a longer version which also introduces the series on a more technical discussion on bitcoins, blockchains, ... https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-what-is-it