I passed on buying an iPad1 due to the fact that by the time they became easily available here in Britain iPad2 specs were making me realise that I would be upgrading in no time at all. Meanwhile I have been in a few stores playing with it... I'm referring to an iPad by the way. Something I have noticed and wanted to know if anyone else gets the same. While the store iPad was sitting in an official iPad dock charging (240v) I ran a flat palm across its back. This was roughly where the battery was. I felt a 'vibration' in my hand. This was NOT an electric shock. It really did feel like the iPad was vibrating. An 'oscillation', if you like. When I ran my hand slowly or quickly over the back of the casing I didn't get the sensation, I only got it when I did it at a certain 'speed'. This is unlikely to put me off buying but I am curious to know what was going on. Are there any professors of electrical thingamajigs amongst you who can satisfy my curiosity? Yours, with the deepest respect.