3 ms·same, I thought everyone learnt this in school when growing up...by mottey 7y agosame, I thought everyone learnt this in school when growing up...6nf 7y agoI learned about the hats in primary school back in the 90spansa2 7y agoI’ve never heard of it before. Sounds like it’s well known in Australia though!Smoosh 7y agoNot everyone. I finished my formal schooling before the book was published.