Uncle Solri's Helpful Hints for Boys and Girls #1

Girls: Unless you want to climb mountains, go fishing or tie up animals (or people), the only knots you will ever need to know are a bow and a reef knot. Learn them well, and they will serve you well.
Boys: As above, though you might want to learn how to tie a tie.

Uncle Solri's Helpful Hints for Boys and Girls #2

When striking your classmates with a ruler, only use the edge if you wish to inflict serious pain; for light-hearted romps, use the flat.