I always hated the advice to make an L with your hands to see which one was Left. No one ever specified whether you're supposed to have your palms facing you or facing away, so it's ambiguous.
When I was a kid, I would picture a dining place setting because I knew the fork was on the left.
That article you linked was a really interesting read. Thanks!
5 years: pay what it costs now
It doesn't cost anything to copyright something. You just automatically own the copyright to something you create.
(This may vary outside the US; I'm not familiar with international copyright law.)
You're thinking of imaginary numbers. Irrational numbers are real numbers that have an infinite number of decimal places and don't repeat.
"Thong" can mean a type of sandal, also known as flip-flops, but it's also the name of a type of underwear or swimsuit bottom that's basically a string in the back.
I grew up calling flip flops "thongs", but as I got older, people were almost exclusively using that term for the underwear, so I switched terms to avoid confusion.
https://en.wikipedia.org/wiki/Flip-flops https://en.wikipedia.org/wiki/Thong
Jam is made with pureed fruit, while jelly is made from fruit juice. Colloquially, though, people use the terms interchangeably constantly.