"Look after your ears kids" is the conclusion of one Brainiac's experiment, testing the hearing capacity of the younger and older members of the audience and the frequencies they can hear.Ironic, given moments later, she's mixing calcium carbide with water and setting it on fire to (loudly) launch socks into the crowd.To be fair, that was modest in comparison to the hydrogen balloon she and her other Brainiacs have just exploded, after they chucked a two-litre bottle of liquid nitrogen into a...