I've donned the red T-shirt while Tom's in the Arctic to tell you something you might not know about batteries. I make other videos on science (normally biology), so if that's your kind of thing, why not pop round?!,(reply>), wait were you not on Lateral,(reply>), You look like Kelsie Monroe.,(reply>), +Jason Witt brine- an electrolyte,(reply>), Sally Le Page is,(reply>), What did you say the cardboard was soaked in? I thought you said brain but i could be wrong.