There are a number of dental appliances used today. But braces are still the primary means for straightening teeth and correcting misaligned bites in children. Braces work by applying pressure to the teeth and jaws to move them into a desired position. Braces are not the shiny mouthful of metal of years past.
In Windows 95 or any later systems, Ctrl-Alt-Delete brings up a window that allows a user to see the status of all currently running programs and to terminate any of them, and also offers the options of shutting down, restarting, and so on (the specific options vary slightly with the particular version of windows).
While unix-line-discard is a good mnemonic, the use of CTRL+U as a line-erase character precedes the invention of UNIX. It was used as such on various Digital Equipment (DEC) systems, including the PDP-8. For instance, from my dusty bookshelf I see that CTRL+U was used as line-erase in the PDP-8 Symbolic Editor (page 5-13 of the 1972 edition of the PDP-8 Introduction To Programming (Volume 1) manual published by DEC). In fact, in the early days of UNIX, the @ character was often the default line-erase character.