In quantum mechanics, there are types of vectors that are written like |a>, which is called a "ket", and their dual vectors as <a|, which are called "bra". You write the scalar product as <a|b>. This is called the Bra-Ket-Notation.
Right, grass here in central Europe grows with no effort at all. I would never in a million years water my lawn. People growing lawns in some North American desert however...
Upvote for using Scala.