My younger daughter switched music teachers last November. Her new lessons are held in a furnished basement studio of a family in Spokane. On our first day, my older daughter was with us but she immediately peeled off to play with the four children of the music teacher and his wife.
Later we found out it's a homeschooling family. My older daughter knew that right away. "How could you tell?" I asked her.
"Because the kids have an advanced vocabulary," she replied. (Honest, that's exactly what she said.)
So as a homeschooling parent, I felt a bit smug when I read that many teens - while they may understand around 40,000 words - have a working vocabulary of only about 800 words. This is known as "teenspeak."