I've always wondered what those things do. I'm glad you actually got them to turn on.
This bothered me bad enough that I actually asked it on yahoo answers lol. (Though I can't find the link
![Sad :(](https://www.omnimaga.org/Smileys/classic/sad.gif)
)
In other news, connecting a 9V battery to them makes them explode. The calculator still works though.