And yes, I've forgotten to mention list mode for statistical functions. Start list on stack by pushing "list marker" ("Fn+xBn", or "list" button) and push as many numbers on the stack as you like. The next statistic operations executed will consume only numbers up to this marker, no other number on the stack below this marker will be touched.

"Mod" discovers trigonometry and logarithm functions, "Mod+Fn" - reverse trigonometry, "Fn" - hyperbolic functions and modulus (%).