one thing the internet has largely diminished is the abundance of completely baseless advice you used to get. your mum would tell you "wait an hour before swimming or you'll get cramps" or "if someone has the hiccups, shout 'boo!' and scare them to get rid of them" and you'd just believe it.
"hey dad, what do you do if you get a jellyfish sting?" "get someone to pee on it." "okay, thanks!" and then you just tuck that little nugget of wisdom away and repeat it when your friend asks you the same question seventeen years later.
do i still believe that the great wall of china is "the only man-made object visible from space?" of course not. does the phrase "visible from space" with no qualifications on distance or camera technology even mean anything? not really. but ask me to name things you can see from the moon and my immediate first instinct will always be to say the great wall of china.