Although it will not help you in any way shape or form, it still is quite interesting to have a look at if you have both the consoles.
I'm sure you know that when you close your 3DS, it automatically goes into sleep mode, meaning the sound automatically turns off, right? Well do you want a way to make it stay on? NO?!
Well I'm telling you anyway.
So, for some reason, when the Nintendo 3DS is in sleep mode and placed on top of a Nintendo DS system, it awakens even though the handheld is closed. And vice-versa - it goes into sleep mode when you're normally playing...
See the video for an example...
So, the lesson to learn from this is don't let your 3DS and DS make love.
(We are 97.631% sure this won't harm your 3DS)
Remember to check back again tomorrow for the next Nintendo Tip!
