Students are using a new ring tone to receive messages in class -- and many teachers can't even hear the ring.
Some students are downloading a ring tone off the Internet that is too high-pitched to be heard by most adults. With it, high schoolers can receive text message alerts on their cell phones without the teacher knowing.
I heard this story on NPR a couple weeks ago as they interviewed the developer of the "Mosquito" and his daughter (she may or may not have used the technology in class ;-).
