Having been silent for quite a long time Josh sighed loudly and moved himself a little to make himself more comfortable on the chair. As he did so he saw Evelyn and his eyes got fixed on her until the professor asked another question which made him jump. Oh! 'Let's hope no one has seen that' he thought then raised his hand to speak. ''Is not there a substance twirling inside it, professor? Like gas or something. I am not sure maybe it is...well...nothing''